Player changes:

- reimplemented & improved player inventory
- now player has "Action2" which means he can interact with the
environment
- added weapon energy cost
- updated player action interface

assets/scenes/Game.scene

@@ -26,12 +26,10 @@
         <Transform x="120" y="100" />
         <Sprite src="sprites/Player.sprite" />
         <SpriteRenderer />
-        <PlayerMovement />
-        <PlayerInventory capacity="30" />
-       
-        <GameObject name="Inventory">
-            <Transform />
-        </GameObject>
+        <Inventory capacity="30" />
+        <Player hp="100" maxHp="100"
+                energy="100" maxEnergy="100"
+                money="50" />
     </GameObject>
     
     <!-- Debug object -->