Use distinct from, to and via markers

[bagage]

It seems there is no way today to know in which the route is going:

It would be nice to have different icon and/or color for start marker and end marker, for instance on osm.org:

[nrenner]

I agree, it's just not implemented yet (Turistforeningen/leaflet-routing#8).

An idea was to first evaluate whether it would make sense to switch to leaflet-routing-machine, which is lacking other features.

[bagage]

Thanks for the quick insight @nrenner. The main advantage of leaflet-routing-machine I see is that it is still under development, but I do not know much more about each project and the lacking features.

If it requires a huge work for replacement maybe I'll give leaflet routing icons configuration a try.

[nrenner]

I updated the dev branch of my leaflet-routing fork that we reference with your PR. You should be able to update to that with yarn upgrade leaflet-routing.