Feature Request: Randomise track colours

[simsala]

When displaying a lot of tracks, I would like to have them displayed in different colours. Having to change every colour by hand is very cumbersome. I would prefer an option to randomise track colours.

[Redsandro]

I very much agree, preferably from a subset of visually pleasant colors. An option to automatically do this, or something you can apply on a selection of tracks as seen in https://github.com/nextcloud/maps/issues/643