Several fixes:

- Fixed bug in stream health function causing loop if track not active
- Fixed DTSC pulls ignoring data before the live point
- Improved async buffers (deque mode) to spread the tracks more fairly
- DTSC pull now implements "ping" and "error" commands
- DTSC pulls report suspicious keyframe intervals to the origin and ask for confirmation
- DTSC output now accepts these reports and disconnects if there is no match in keyframe intervals
- Outputs in async mode now keep the seek point in all tracks when reselecting
- Outputs in async mode now default to a starting position in each track that is at a keyframe roughly halfway in the buffer
- Outputs in async mode now ignore playback rate (always fastest possible)
- Removed code duplication in prepareNext function
- Reordered the prepareNext function somewhat to be easier to follow for humans
- DTSC output no longer overrides initialSeek function, now uses default implementation
- Sanitycheck output now supports both sync and async modes, supports printing multiple timestamps for multiple tracks

lib/stream.h

@@ -75,6 +75,7 @@ namespace Util{
       void moveFirstToEnd();
       bool hasEntry(size_t tid) const;
       void getTrackList(std::set<size_t> &toFill) const;
+      void getTrackList(std::map<size_t, uint64_t> &toFill) const;
       void setSyncMode(bool synced);
       bool getSyncMode() const;
     private: