Add gamepad support: stick look, trigger fire, pad menu confirm

- project.godot: joypad events on the ten existing actions (left stick move,
  A jump, right trigger/RB fire, X reload, B/LB grenade, Start pause, Back
  fullscreen), four new look_* actions on the right stick (deadzone 0.2) and
  ui_accept/ui_cancel redefined with the pad buttons A/B while keeping
  Enter/KP Enter/Space/Esc: the 4.7.1 engine maps no pad button on those.
- scripts/player.gd: gamepad_mode turns on by itself on the first pad input;
  _can_aim() replaces the "mouse captured" gate of shoot and grenade (the pad
  never captures the pointer, same trap already fixed for touch);
  _handle_gamepad_look() converts the right stick into equivalent relative
  mouse pixels (900 px/s at full deflection, m^1.8 response) and still goes
  through apply_look(); restart accepts A/X and the death text follows the
  device in use.
- scripts/start_screen.gd: pad hint shown only when a controller is connected,
  refreshed on Input.joy_connection_changed.
- tools/test_gamepad.gd: 33 checks on map structure, keyboard preservation,
  real event pipeline, gamepad_mode and analog look.
- docs/GAMEPAD.md: mapping, code map, verification, known limit (kiosk name
  entry still needs a keyboard: on-screen keyboard is the next step).

Verified: test_gamepad 33/33, test_fullscreen_shortcut 8/8, test_touch_controls
14/14 (--touch), test_grenade 24/24, test_boss 50/50, test_rebalance_branding
14/14, test_player_profile 30/30. test_start_screen keeps its 2 pre-existing
headless failures (identical on HEAD).

project.godot

@@ -44,54 +44,104 @@ move_forward={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"location":0,"echo":false,"script":null)
 , Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194320,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":1,"axis_value":-1.0,"script":null)
 ]
 }
 move_back={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
 , Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194322,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":1,"axis_value":1.0,"script":null)
 ]
 }
 move_left={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":0,"axis_value":-1.0,"script":null)
 ]
 }
 move_right={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":0,"axis_value":1.0,"script":null)
 ]
 }
 jump={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":32,"key_label":0,"unicode":32,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":0,"pressure":0.0,"pressed":false,"script":null)
 ]
 }
 shoot={
 "deadzone": 0.5,
 "events": [Object(InputEventMouseButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":1,"position":Vector2(0, 0),"global_position":Vector2(0, 0),"factor":1.0,"button_index":1,"canceled":false,"pressed":true,"double_click":false,"script":null)
+, Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":5,"axis_value":1.0,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":10,"pressure":0.0,"pressed":false,"script":null)
 ]
 }
 reload={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":82,"key_label":0,"unicode":114,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":2,"pressure":0.0,"pressed":false,"script":null)
 ]
 }
 pause={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194305,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":6,"pressure":0.0,"pressed":false,"script":null)
 ]
 }
 
 toggle_fullscreen={
 "deadzone": 0.5,
 "events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":70,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":4,"pressure":0.0,"pressed":false,"script":null)
 ]
 }
 
 grenade={
 "deadzone": 0.5,
-"events": [Object(InputEventMouseButton, "button_index":2)]
+"events": [Object(InputEventMouseButton, "button_index":2), Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":1,"pressure":0.0,"pressed":false,"script":null), Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":9,"pressure":0.0,"pressed":false,"script":null)]
+}
+
+look_left={
+"deadzone": 0.2,
+"events": [Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":2,"axis_value":-1.0,"script":null)
+]
+}
+
+look_right={
+"deadzone": 0.2,
+"events": [Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":2,"axis_value":1.0,"script":null)
+]
+}
+
+look_up={
+"deadzone": 0.2,
+"events": [Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":3,"axis_value":-1.0,"script":null)
+]
+}
+
+look_down={
+"deadzone": 0.2,
+"events": [Object(InputEventJoypadMotion, "resource_local_to_scene":false,"resource_name":"","device":-1,"axis":3,"axis_value":1.0,"script":null)
+]
+}
+
+ui_accept={
+"deadzone": 0.5,
+"events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194309,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194310,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":32,"physical_keycode":0,"key_label":0,"unicode":32,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":0,"pressure":0.0,"pressed":false,"script":null)
+]
+}
+
+ui_cancel={
+"deadzone": 0.5,
+"events": [Object(InputEventKey, "resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194305,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+, Object(InputEventJoypadButton, "resource_local_to_scene":false,"resource_name":"","device":-1,"button_index":1,"pressure":0.0,"pressed":false,"script":null)
+]
 }
 
 [rendering]