winSPMBT V11.01 upgrade for 2017

[dmnt]

Originally Posted by DRG

* CD / extended version holders will now get a warning message if they try to enter a building hex with a vehicle. You are now asked to confirm that you really want to do that. This is to stop you from inadvertently immobilising yourself as most cases involving building entry with vehicles is the result of a too long movement call through an urban built up area. The feature will also display on rough+slope combinations if you have travelled 3 or more hexes and thus are in danger of sticking. It's just a "friendly reminder."

I found a small bug (well, unwanted feature perhaps) with the rough+slope code: if there is a road that goes thru that hex then the warning should not appear.

How to reproduce: create a map with a rough slope hex and add a secondary road thru that hex. The game will then ask for confirmation even though the road prevents the vehicle from losing mobility.