Route colors in hiking mode

[rstruminski]

When in Hiking mode, sometimes I'd like to hide the International/National/Regional/Local routes, or at least make them a little more transparent or change their color.

Their bright blue/red/green/yellow can be very distracting when you zoom out a little. It is then quite hard to distinguish them from your self-created route(s).

[andreynovikov]

This is a good proposal, I will think how to implement it in clean way.