Add the window with route preview

[anastasiia936]

Add a finger moveable window frame to real-time displaying the whole route preview.

This is a must have to real-time control your route on the fly during its progress to fix any circumstances that could alter or not optimizing it in proper time!
There are many cases when the route can be altered or not matching the other current roads status or availabilities, sometimes even a faulty touch of the screen may alter the whole route or destination without proper visible notifying.
The best is to also permanently display the final destination during any route progress somewhere on the navigation screen
ANYWAY displaying Global whole route preview in a corner of the navigation screen helps a lot of various circumstances even by a new click control icon to toggle between current navigation and the whole route preview