2 taps for instructions

[graue]

In my experience watching people use BikeHopper, when they click on an itinerary other than the first one, they usually just want to highlight it on the map, and don't want to go into the detailed instructions screen.

This change makes it so that the first tap on an unselected itinerary just highlights it, while tapping on an already selected itinerary still goes into the instructions.

To hint that step-by-step instructions are available, a new bullet-point list icon is shown on the selected itinerary.

Default state:

After tapping once on second itinerary:

[abhumbla]

I like this I think

[Andykmcc]

I like this too

[graue]

I'll interpret your comments as approving the PR, thank you!