Navigation instructions improvements

[rinigus]

From https://talk.maemo.org/showpost.php?p=1549254&postcount=239

• random ideas to make instructions clearer :
  -on Navteq in-car, the display goes into split screen. Next to the regular perspective few, there is a top down view zoomed on the exit, round-about, etc.
• on Tomtom satnavs, the screen is replaced by a cartoon showing the signs and underneath a plan of the path that needs to be taken
  (Garmin Drive Assist uses a combo of stored photos and live-feed from the dash-cam to show the exact actual exit)
  The latter isn't currently possible, but if the former two inspire you.

[AppsLee]

Hi, thanks for the great work.
Last night I noticed that roundabout instruction could be easier to read.
I'm usign UBPorts and the text stating to take the N th exit is not easy to read while driving.
In most GPS apps, the exit number is displayed in the middle of the roundabout logo, this way you can easily access the information without staring too much at the screen.

[rinigus]

I will look into it, if this info is available from provided router response.

[rinigus]

roundabout exit number was added and released with 2.2.0