Add a interface for the C++ side (TsWriter) to allow setup tv and tv plugin to fetch the signal quality counters (discontinuity & processed TS packet count)



h4. Additional Information
/// <summary>
/// Fetches the stream quality information
/// </summary>
/// <param name="handle">Handle of the sub channel</param>
/// <param name="totalTsBytes">Amount of packets processed - timeshifting</param>
/// <param name="totalRecordingBytes">Amount of packets processed - recording</param>
/// <param name="TsDiscontinuity">Number of stream discontinuities - timeshifting</param>
/// <param name="recordingDiscontinuity">Number of stream discontinuities - recording</param>
/// <returns></returns>
[PreserveSig]
int GetStreamQualityCounters(int handle, out int totalTsBytes, out int totalRecordingBytes,
  out int TsDiscontinuity, out int recordingDiscontinuity);