1.6.6 ai changes

This should make the AI less frustrating. I'd really like to make the flanking behavior consider distance too, but that change might be hard to do.

Added 6 commits:

• 312d1a5a - Fix
• 91fe1235 - Add an Actor.ai_spread_add property that reduces the accuracy of aiSeetargetPos
• 6134901d - Add a talent property that prevents difficulty from increasing its level
• 64f085c3 - Prevent Shriek and Howl from scaling with difficulty
• 0a3553df - Reduce Howl rank on Gorbat
• 28780ca7 - Reduce AI chase accuracy during Burrow and Movement Infusion

mentioned in commit 01d9d350

Status changed to merged