[Feature] Grey-out all other routes when one is clicked

[edbourque0]

I have searched the existing feature requests to make sure this is not a duplicate request.

• Yes

The feature

I would love that when I click on a route, all other routes shown on the map becomes grey-out or less opaque so that the map only shows this specific route.

[johanohly]

See my comment on #153

[johanohly]

This has been added in v2.0.0!