Enhance map visualization

[noerw]

No description provided.

[noerw]

As a basic visualization is already included, this issue now tracks further enhancements to the trajectory visualization

@felixerdy Do you already have ideas for the visualization?
Thinking about it, for lots of datapoints..

• points might be more readable than lines
• leaflet performance will break down (mapbox gl or deck.gl instead?)
• current location should be highlighted

[felixerdy]

I was also thinking about using mapbox.gl but waited until there is an initial tracking service. I guess I'll start to try out Leaflet and mapbox.gl