added actor ID
a bit of cleanup
some missing cleanup
Merge branch 'actorid' of https://github.com/OpenMW/openmw

Conflicts:
	apps/openmw/mwmechanics/creaturestats.cpp
Fix self-defense for creatures when attacked with a spell
Don't attempt to inflict spells on dead actors
Fixes #1129: Change summoned creatures to use ActorId

Gracefully handles summoned creatures that are left behind in inactive cells.