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/protocolgame.lua

@@ -1,15 +1,23 @@
 local opcodeCallbacks = {}
+local extendedCallbacks = {}
 
 function ProtocolGame:onOpcode(opcode, msg)
   for i, callback in pairs(opcodeCallbacks) do
     if i == opcode then
-      callback(msg)
+      callback(self, msg)
       return true
     end
   end
   return false
 end
 
+function ProtocolGame:onExtendedOpcode(opcode, buffer)
+  local callback = extendedCallbacks[opcode]
+  if callback then
+    callback(self, opcode, buffer)
+  end
+end
+
 function ProtocolGame.registerOpcode(opcode, callback)
   if opcodeCallbacks[opcode] then
     error('opcode ' .. opcode .. ' already registered will be overriden')
@@ -21,3 +29,31 @@ end
 function ProtocolGame.unregisterOpcode(opcode)
   opcodeCallbacks[opcode] = nil
 end
+
+function ProtocolGame.registerExtendedOpcode(opcode, callback)
+  if not callback or type(callback) ~= 'function' then
+    error('Invalid callback.')
+  end
+
+  if opcode < 0 or opcode > 255 then
+    error('Invalid opcode. Range: 0-255')
+  end
+
+  if extendedCallbacks[opcode] then
+    error('Opcode is already taken.')
+  end
+
+  extendedCallbacks[opcode] = callback
+end
+
+function ProtocolGame.unregisterExtendedOpcode(opcode)
+  if opcode < 0 or opcode > 255 then
+    error('Invalid opcode. Range: 0-255')
+  end
+
+  if not extendedCallbacks[opcode] then
+    error('Opcode is not registered.')
+  end
+
+  extendedCallbacks[opcode] = nil
+end