feat: add keybindings configuration for game controls and menus

conf/keybindings_PC.yaml

@@ -0,0 +1,30 @@
+keybinding_game:
+  keydown_Return: spawn_rat
+  keydown_D: kill_rat
+  keydown_M: toggle_audio
+  keydown_F: toggle_full_screen
+  keydown_Up: start_scrolling|Up
+  keydown_Down: start_scrolling|Down
+  keydown_Left: start_scrolling|Left
+  keydown_Right: start_scrolling|Right
+  keyup_Up: stop_scrolling
+  keyup_Down: stop_scrolling
+  keyup_Left: stop_scrolling
+  keyup_Right: stop_scrolling
+  keydown_Space: spawn_new_bomb
+  keydown_N: spawn_new_nuclear_bomb
+  keydown_Left_Ctrl: spawn_new_mine
+  keydown_P: toggle_pause
+  keydown_G: spawn_new_gas
+  
+keybinding_start_menu:
+  keydown_Return: reset_game
+  keydown_Escape: quit_game
+  keydown_M: toggle_audio
+  keydown_F: toggle_full_screen
+
+keybinding_paused:
+  keydown_Return: reset_game
+  keydown_Escape: quit_game
+  keydown_M: toggle_audio
+  keydown_F: toggle_full_screen