This adds a new enum called EncodingPreference with following values

- NoPreference
    - Veryfast preset, no tune
    - Default usecase
- Quality
    - Medium preset, no tune
    - Good for high quality video
- Speed
    - Ultrafast preset, zerolatency tune
    - Good for streaming
- Size
    - Slow preset, no tune
    - Should be the smallest size when encoded