Possibility to configure EncodedAudioPassthrough on renderer level

When I added this "feature" I spotted that EncodedAudioPassthrough code is missing for FFMpeg engine.
Also spotted some missing code comparing to MEncoder engine:
```
- missing "convertToMod4"
- missing Wrapped AC-3/DTS
- ISO not supported in ffmpeg? (isCompatible -> missing PlayerUtil.isVideo(resource, Format.Identifier.ISO)
- .... ( out of time to check deeper :( )
```
Can't say if it is by design (no support from ffmpeg side) or not so I pulled only changes for tsMuxeR and MEncoder