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_skills/skills.otmod

@@ -6,3 +6,7 @@ Module
 
   @onLoad: |
     dofile 'skills'
+    Skills.init()
+
+  @onUnload: |
+    Skills.terminate()