Thorough(!) remodeling of the arch/ directory and the contents therein; fixed link-time warnings on GCC and should make things a lot easier to manage. A pile of other random things too, mostly cleanups and getting things to work with the remodeled arch/ directory.

stepmania/src/arch/LoadingWindow/LoadingWindow_Win32.h

@@ -25,8 +25,7 @@ private:
 
 	static BOOL CALLBACK WndProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam );
 };
-
-#define HAVE_LOADING_WINDOW_WIN32
+#define USE_LOADING_WINDOW_WIN32
 
 #endif