Updated ProgressState.ToString()
Wait for background thread to exit in FFmpegPlugin.cs
Minor/ignore - Renamed FFmpegOnExited to OnExited in FFmpeg.cs
Updated ProgressState.ToString() to only output hh:mm:ss for TimeElapsed and TimeRemaining
Fixed FFmpeg language metadata bug
Use ProgressState.ToString() and print to same line in console in FFmpeg.OnProgressUpdated()