sandbox is now a sandbox again; add a Test container, move

the sound test into a separate screen and add a font test

stepmania/src/ScreenSandbox.h

@@ -12,14 +12,8 @@
 */
 
 #include "Screen.h"
-#include "Sprite.h"
-#include "BitmapText.h"
-#include "Quad.h"
-#include "MenuElements.h"
-#include "RageSound.h"
 #include "Sample3dObject.h"
-
-const int nsounds = 5;
+#include "Quad.h"
 
 class ScreenSandbox : public Screen
 {
@@ -30,20 +24,8 @@ public:
 	virtual void HandleScreenMessage( const ScreenMessage SM );
 
 	void Update(float f);
-	void UpdateText(int n);
-
-	struct Sound {
-		RageSound s;
-		BitmapText txt;
-	};
-	Sound s[nsounds];
-	BitmapText HEEEEEEEEELP;
-	
-	int selected;
-
-	Quad m_quad;
-	Sprite m_sprite;
 	Sample3dObject obj;
+	Quad m_quad;
 };