Add operator== and operator!= as well as getting all matching steps for a particular song.

stepmania/src/SongUtil.h

@@ -35,6 +35,15 @@ public:
 	}
 
 	bool Matches( const Song *p ) const;
+	bool operator==( const SongCriteria &other ) const
+	{
+#define X(x) (x == other.x)
+		return X(m_sGroupName) && X(m_bUseSongGenreAllowedList) && X(m_vsSongGenreAllowedList) &&
+			X(m_Selectable) && X(m_bUseSongAllowedList) && X(m_vpSongAllowedList) &&
+			X(m_iStagesForSong) && X(m_Tutorial) && X(m_Locked);
+#undef X
+	}
+	bool operator!=( const SongCriteria &other ) const { return !operator==( other ); }
 };
 
 namespace SongUtil