initial move of script opcodes and registerExtensions functions to components/compiler
Implemented drowning.

Currently no visual effects on losing health, the breathing sound doesn't change (we don't have one),
the breath bar doesn't turn red when no breath left and it doesn't pulse from black to red.
mild cleanup
Merge branch 'master' of https://github.com/zinnschlag/openmw into compiler-reorg
cleanup
Remove unused function
Handle NPCs being a werewolf in NpcAnimation

Note that the body mesh comes from having a WerewolfRobe force-equipped.
Remove some duplicate code
Remove unnecessary mBodyPrefix field
Update part skeletons immediately when added
Fix werewolf claw damage multiplier