Use Init() for all screens, so we can set state before the base class

members are loaded--they'll see resets, score finalization, etc.  It
also results in smaller code, due to a g++ bug that causes constructors
to be emitted several times.

stepmania/src/ScreenTest.cpp

@@ -31,6 +31,12 @@ REGISTER_SCREEN_CLASS( ScreenTest );
 ScreenTest::ScreenTest( CString sClassName ) : Screen( sClassName )
 {
 	current = NULL;
+}
+
+void ScreenTest::Init()
+{
+	Screen::Init();
+
 	cur_screen = -1;
 
 	SOUND->StopMusic();