[loading window] Trying to clean up the in game song reloading.

src/InGameLoadingWindow.h

@@ -0,0 +1,19 @@
+#include "arch/LoadingWindow/LoadingWindow.h"
+#include "BitmapText.h"
+#include "RageTimer.h"
+#include "global.h"
+#include "ActorFrame.h"
+
+class InGameLoadingWindow: public LoadingWindow, public ActorFrame {
+
+public:
+	InGameLoadingWindow();
+	~InGameLoadingWindow();
+
+	void SetText( RString str );
+
+private:
+	RageTimer m_LastDraw;
+	BitmapText m_Text;
+};
+