BEAWARE all game functionality is disabled with this commit for a while

* rework client modules
* hide main window when loading
* remake top menu functions
* rework modules autoload
* improve path resolving for otml and lua
* move core_widgets to core_lib
* fix tooltip issues
* split some styles
* add bit32 lua library
* fix assert issues
* fix compilation on linux 32 systems
* rework gcc compile options
* renable and fix some warnings
* remove unused constants
* speedup sprite cache
* move UIGame to lua (not funcional yet)
* fix a lot of issues in x11 window
* fix crash handler
* add some warnings do uiwidget
and much more...

modules/client_background/background.lua

@@ -7,11 +7,18 @@ local background
 function Background.init()
   background = displayUI('background.otui')
   background:lower()
+
+  connect(g_game, { onGameStart = Background.hide })
+  connect(g_game, { onGameEnd = Background.show })
 end
 
 function Background.terminate()
+  disconnect(g_game, { onGameStart = Background.hide })
+  disconnect(g_game, { onGameEnd = Background.show })
+
   background:destroy()
   background = nil
+
   Background = nil
 end