Use new coding style in game modules

Lots of refactoring and changes
Remove docs folder

modules/game_shaders/shaders.otmod

@@ -3,13 +3,6 @@ Module
   description: Manage game shaders
   author: edubart
   website: www.otclient.info
-
-  dependencies:
-    - game_interface
-
-  @onLoad: |
-    dofile 'shaders'
-    Shaders.init()
-
-  @onUnload: |
-    Shaders.terminate()
+  scripts: [ shaders.lua ]
+  @onLoad: init()
+  @onUnload: terminate()