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_npctrade/npctrade.lua

@@ -34,7 +34,7 @@ playerItems = nil
 selectedItem = nil
 
 function init()
-  npcWindow = g_ui.displayUI('npctrade.otui')
+  npcWindow = g_ui.displayUI('npctrade')
   npcWindow:setVisible(false)
 
   itemsPanel = npcWindow:recursiveGetChildById('itemsPanel')

modules/game_npctrade/npctrade.otmod

@@ -4,6 +4,6 @@ Module
   author: andrefaramir, baxnie
   website: www.otclient.info
   sandboxed: true
-  scripts: [ npctrade.lua ]
+  scripts: [ npctrade ]
   @onLoad: init()
   @onUnload: terminate()