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/gamelib/spells.lua

@@ -1,6 +1,6 @@
 SpelllistSettings = {
   ['Default'] = { 
-    iconFile = 'icons.png',
+    iconFile = 'defaultspells',
     iconSize = {width = 32, height = 32},
     spellListWidth = 210,
     spellWindowWidth = 550,
@@ -9,7 +9,7 @@ SpelllistSettings = {
   },
   
   ['Sample'] =  { 
-    iconFile = 'sample.png', 
+    iconFile = 'sample', 
     iconSize = {width = 64, height = 64},
     spellIcons = {[1] = 'Wind Walk', [2] = 'Fire Breath', [3] = 'Moonglaives', [5] = 'Firefly', [4] = 'Critical Strike'},
     spellOrder = {'Critical Strike', 'Firefly', 'Fire Breath', 'Moonglaives', 'Wind Walk'}