restore inventory and healthbar

* make inventory/healthbar work again allowing reload
* changes in top menu toggle buttons
* all modules are now reloadable by default
* fix warning when using fade in
* remove some unused files

modules/game_inventory/inventory.otmod

@@ -4,5 +4,13 @@ Module
   author: OTClient team
   website: https://github.com/edubart/otclient
 
+  dependecies:
+    - game
+
   @onLoad: |
     dofile 'inventory'
+    Inventory.init()
+
+  @onUnload: |
+    Inventory.terminate()
+