Multi-protocol

Lots of chagnes to add multi protocol flexibility, not really
completed yet, still have to rework text messages opcodes and other stuff,
so this still a working in progress feature

* Rework dat reader, the dat reader can now
* dinamically detect dat version
* Split game into gamelib and game_interface
* Lots of other minor changes

modules/client_extended/extended.lua

@@ -55,4 +55,4 @@ function Extended.unregister(opcode)
 
   callbacks[opcode] = nil
   return true
-end
+end