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/ScreenHowToPlay.h

@@ -13,6 +13,7 @@ class ScreenHowToPlay : public ScreenAttract
 {
 public:
 	ScreenHowToPlay( CString sName );
+	virtual void Init();
 	~ScreenHowToPlay();
 	
 	virtual void Update( float fDelta );