Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

src/framework/graphics/framebuffer.cpp

@@ -47,7 +47,7 @@ void FrameBuffer::internalCreate()
 
 FrameBuffer::~FrameBuffer()
 {
-    assert(!g_app->isTermianted());
+    assert(!g_app.isTermianted());
     if(g_graphics.ok() && m_fbo != 0)
         glDeleteFramebuffers(1, &m_fbo);
 }