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/hardwarebuffer.cpp

@@ -37,7 +37,7 @@ HardwareBuffer::HardwareBuffer(Type type)
 
 HardwareBuffer::~HardwareBuffer()
 {
-    assert(!g_app->isTermianted());
+    assert(!g_app.isTermianted());
     if(g_graphics.ok())
         glDeleteBuffers(1, &m_id);
 }