As part of our hook processing, we destroy modular-avatar components;
however, when entering play mode (without av3emu), these components
might be prefab assets. To avoid scary unity errors, unpack these prefabs
when entering play mode.
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.
