[timingdata] Let's break things! (for now)

src/Song.h

@@ -284,7 +284,10 @@ public:
 	bool Matches(RString sGroup, RString sSong) const;
 
 	/** @brief The Song's TimingData. */
-	TimingData m_Timing;
+	TimingData m_SongTiming;
+
+	/** @brief The initial offset of a song. */
+	float	m_fBeat0OffsetInSeconds;
 
 	typedef vector<BackgroundChange> 	VBackgroundChange;
 private:

src/Steps.h

@@ -31,6 +31,9 @@ public:
 	/** @brief Destroy the Steps that are no longer needed. */
 	~Steps();
 
+	/** @brief Timing data */
+	TimingData m_SongTiming;
+
 	// initializers
 	void AutogenFrom( const Steps *parent, StepsType ntTo );
 	void CopyFrom( Steps* pSource, StepsType ntTo, float fMusicLengthSeconds );