This change adjusts the layer indices for animator layer control state behaviors, assuming
that the reference is for a layer in the same animator. This partially addresses #67 for v1.0;
fully addressing this requires figuring out how to specify a reference to an arbitrary other Merge
Animator target.
This adds support for animation mapping for MergeArmature components, as well as supporting locking the position of
MergeArmature-controlled transforms to their original counterparts, to ease animation editing.
With this change it might be best to eliminate the bone proxy component, as it's a bit redundant now.
