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/InputHandler/InputHandler_DirectInput.h

@@ -27,6 +27,7 @@ public:
 	void Update(float fDeltaTime);
 	void WindowReset();
 };
+#define USE_INPUT_HANDLER_DIRECTINPUT
 
 #endif