Review screen does not use custom speed units

[leezer3]

Custom speed units can now be set via Route.DisplaySpeed but these are not reflected in the review screen.

Requires changing.

[leezer3]

Note:
Section & signal speed limits are displayed in the F10 debug window in km/h
These possibly ought to be changed, although I'm in two minds about this, as speeds in the routefile are in km/h, and this screen isn't really for driving use,

[mgavioli]

Another case are overspeed messages, which also are always in km/h, regardless of the route setting.

I understand your concern about the F10 debug window; still, I imagine it can be useful to route developers to have that indication in the route specific speed unit. What about having both km/h and mph (one reported from route data and the other computed), at least for mph routes?