Combat AI: avoid friendly fire from area spells
Current implementation of combat AI does not bother to check if there are friendly actors in spell damage area (e.g. for "fireball" spell).
Note: vanilla AI does not do this check too, but it would be nice to implement it.
(RM-3947 from redmine: created on 2017-07-05 by Andrei Kortunov, , duplicates #4280 (closed))