Option to rearrange tracks/streams

[mifi]

Ability to change the order of the video/audio/subtitle(etc) tracks.

Note that currently this can be done manually by:

• extracted all tracks as separate files
• open the desired first file in losslesscut
• drag drop the desired Nth file into losslesscut and add the track
• export the file with the new track order

This has been discussed in #1589

Kind of related to #1670