Register MusicWheel as a Lua class.

Now Lua functions on MusicWheel actually exist.

src/MusicWheel.cpp

@@ -1657,6 +1657,9 @@ public:
 	}
 };
 
+LUA_REGISTER_DERIVED_CLASS( MusicWheel, WheelBase )
+// lua end
+
 /*
  * (c) 2001-2004 Chris Danford, Chris Gomez, Glenn Maynard
  * All rights reserved.

src/MusicWheel.h

@@ -50,6 +50,9 @@ public:
 	RString JumpToPrevGroup();
 	const MusicWheelItemData *GetCurWheelItemData( int i ) { return (const MusicWheelItemData *) m_CurWheelItemData[i]; }
 
+	// Lua
+	void PushSelf( lua_State *L );
+
 protected:
 	MusicWheelItem *MakeItem();