add lua binding

stepmania/src/TimingData.h

@@ -4,6 +4,7 @@
 #define TIMING_DATA_H
 
 #include "NoteTypes.h"
+struct lua_State;
 
 #define COMPARE(x) if(x!=other.x) return false;
 
@@ -132,6 +133,9 @@ public:
 	void InsertRows( int iStartRow, int iRowsToAdd );
 	void DeleteRows( int iStartRow, int iRowsToDelete );
 
+	// Lua
+	void PushSelf( lua_State *L );
+
 	RString				m_sFile;		// informational only
 	vector<BPMSegment>		m_BPMSegments;	// this must be sorted before gameplay
 	vector<StopSegment>		m_StopSegments;	// this must be sorted before gameplay