* AI configuration dialog with options for:
- Group patrol and attack formation.
- Movement speed, including a custom "smart" mode where AI runs in open areas and moves slowly in cover.
- Allowing last remaining units from a wiped out group join a new group nearby.
* More forest detection improvements, again.

Fix respawn point at the airbase not working

Increase sensitivity for forest detection.
Decrease flanking distance for positions among buildings the same way as with forests.
Make initially spawned groups keep formation more.