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/client.otmod

@@ -0,0 +1,23 @@
+Module
+  name: client
+  description: Initialize the client and setups its main window
+  author: OTClient team
+  website: https://github.com/edubart/otclient
+  autoload: true
+  autoload-priority: 100
+
+  load-later:
+    - client_topmenu
+    - client_background
+    - client_about
+    - client_options
+    - client_terminal
+    - client_modulemanager
+    - client_entergame
+
+  @onLoad: |
+    dofile 'client'
+    Client.init()
+
+  @onUnload: |
+    Client.terminate()