[b19] Enemy AI makes dumb use of Frozen Spear rune

[Grey]

I've seen a few enemies created with a frozen spear rune, some causing over 400 damage with them, and to my tremendous relief they're too dumb to use them properly. As soon as they see you they fire, which always seems to be right into the back of one of their mates. After that the rune is on cooldown and you can finish them off easily.

Basically AI should check for clear path to target when using runes, like archers do.

[martinuzz]

Ah yes, please! I think that would also prevent my golem from firing it's beam attack runes through my alchemist