Integrate C++11 branch into 5_1-new

src/RageSoundReader_Chain.h

@@ -57,7 +57,7 @@ private:
 		int iIndex; // into m_apLoadedSounds
 		int iOffsetMS;
 		float fPan;
-		RageSoundReader *pSound; // NULL if not activated
+		RageSoundReader *pSound; // nullptr if not activated
 
 		int GetOffsetFrame( int iSampleRate ) const { return int( int64_t(iOffsetMS) * iSampleRate / 1000 ); }
 		bool operator<( const Sound &rhs ) const { return iOffsetMS < rhs.iOffsetMS; }