Export trips to a geo file format

[jeyemwey]

Is your feature request related to a problem? Please describe.
As a user, I'd like to track my journeys via Träwelling, and later export my trips to other kinds of software, such as Geo-Spatial Software.

Describe the solution you'd like
Add an option to the exporting view, generate a file with all trips in a specified time frame. This file should contain:

• Journeys (origin, destination with date times) and additional data (status text? mode of transport? Operator?)
• Polyline data of the track, if available
• Interim stops

Describe alternatives you've considered
We need to research which file format is widely accepted and can contain the data. From my Geocaching days, I remember KML and GPX, but I have no idea if they're replaced by something newer/fancier/cooler/easier.

Additional context

• Inspired by this thread that mentioned Träwelling on the side.

[MrKrisKrisu]

We need to research which file format is widely accepted and can contain the data.

I would prefer GeoJSON for this export.