Refactor key handling and add keybindings configuration for game actions

rats.py

@@ -22,7 +22,7 @@ class MiceMaze(
         self.full_screen = False
         self.render_engine = engine.GameWindow(self.map.width, self.map.height, 
                                         self.cell_size, "Mice!", 
-                                        key_callback=(self.key_pressed, self.key_released, self.axis_scroll))
+                                        key_callback=self.trigger)
         self.load_assets()
         self.render_engine.window.show()
         self.pointer = (random.randint(1, self.map.width-2), random.randint(1, self.map.height-2))
@@ -68,6 +68,15 @@ class MiceMaze(
         self.background_texture = None
         for _ in range(5):
             self.spawn_rat()
+            
+    def reset_game(self):
+            self.pause = False
+            self.game_status = "game"
+            self.game_end = (False, None)
+            self.units.clear()
+            self.points = 0
+            self.start_game()
+
     
     # ==================== GAME LOGIC ====================