[feature request] Option to set color of GPX manually

[wimpel]

Uploaded gpx-files are automatically getting the color of the type they are given (probably since gpx-format does not support colors insite the .gpx file).
It would be nice to have the option to set the color of the track manually, to distingiush between multipe walks from the same location on the same trip (and/or day).

[Fl0ken]

Seconding this. We use multiple gpx files to compare routes and it would be great if we could have them in different colors to better see where the differences are/were.

[mauriceboe]

@wimpel @Fl0ken coming in 4.0.0! <3