Highlight destination marker when holding destination button

[migueldgoncalves]

Evolution of the #29.

By holding a destination button, the corresponding marker would be centered in the map (highlighted with other color?) and respective button would be highlighted as well (with what color?).

Holding button again would reset map.

-What level of zoom to apply for the centered surrounding location?

-Clicking directly destination marker would highlight respective button?

Reason to discard: Usual navigation in the app is too fast for this