It's a bit unwieldy to have them stored in the 'skeleton master' instead
of the skeleton instance. And although the text keys are extracted for
each created instance now, this shouldn't be much worse than the
multimap copying going on before.
Plus, proper serialization can help for future optimizations.
This is still incomplete guess work. Currently it seems as though flag 0x20
specifies whether the controllers auto-play (if on), rather than follow the
object's animation time.