Group header include

Header parts:

bool CanPauseStream() override;
bool CanSeekStream() override;
void PauseStream(bool paused) override;
bool IsRealTimeStream() override;
PVR_ERROR GetStreamTimes(kodi::addon::PVRStreamTimes& times) override;
PVR_ERROR GetStreamReadChunkSize(int& chunksize) override;