Borrowing ideas from sslCreatureAnimationDefaults

Still not working. Creatures animations do not appear on the creature
animations tab in SL. They appear on the general tab.
Working creature anim registration

When registering a creature animation, we need to use
RegisterCreatureAnimation(), sslCreatureAnimationSlots.GetByRegistrar(),
sslCreatureAnimationSlots.FindByName. Also, we need to call SetRaceIDs()
and initialize the creature arrays.
Template script ready

Template + documentation ready (_SLAnimInjector_template).
ToDo: create 2 examples of registration, 1 for humans, 1 for creatures,
re-test, beta release.
_SLAnimInjectorMCMInit update

Removed commented-out code
Working. Ready to Merge.

Tested and working.
Renamed source scripts to *_example.psc and *_template.psc for safety.
Deleted _SLAnimInjector.pex as the animator will create this (compile).
Merge pull request #3 from GAntono/0.2b-creature-registration

0.2b creature registration