[isomap] 28 - smooth Z movement and unit collisions

Описание: Lots of little bits done. Most important pieces:
-units now move properly in the Z axis (height) across the landscape
-units no longer drive through each other
-units try to find a way around obstacles when something gets in the way


It's still very much a work in progress, but one baby step at a time will get you a long way eventually :)


Code available here: https://github.com/dvdouden/isomap
The code used in this video: https://github.com/dvdouden/isomap/re...