Refactor modules, closes #223

* All modules are sandboxed now
* All images,sounds,fonts,translations and styles were moved to "data" folder
* Reorganize image files folders
* Remove unmaintained modules: client_particles, client_shaders
* Implement new automatic way to load styles and fonts
* Add hide/show offline option in VipList
* Add invite/exclude to/from private channel in players menus
* Many other minor changes

modules/game_modaldialog/modaldialog.lua

@@ -1,5 +1,5 @@
 function init()
-  g_ui.importStyle('modaldialog.otui')
+  g_ui.importStyle('modaldialog')
 
   connect(g_game, { onModalDialog = onModalDialog,
                     onGameEnd = destroy })

modules/game_modaldialog/modaldialog.otmod

@@ -5,6 +5,6 @@ Module
   website: www.otclient.info
   sandboxed: true
   dependencies: [ game_interface ]
-  scripts: [ modaldialog.lua ]
+  scripts: [ modaldialog ]
   @onLoad: init()
   @onUnload: terminate()