Changes in 1.9.0 broke existing avatars that used animators with
different default values than the MA Parameters fields. This change
makes overriding the animator defaults require an explicit configuration;
this is technically a change which would require a minor version bump,
but as this is addressing a major-version-level compatibility break in 1.9.0,
we're going to push this out at a minor version this time.
* chore: refactor state machine clone logic out as a separate class
* feat: add layer priority and relative path root options to Merge Animator
* feat: add Merge Blend Tree component
* chore: adjust NDMF dependency
* docs: update merge-animator docs
* docs: merge blend tree docs
* chore: rearrange package structure to have the package at the root
* ci: update CI workflows
* ci: fixing workflow bugs
* ci: recurse building .zip package
* ci: more fixes
* ci: add back in the nadena.dev VPM repo
* ci: fix tests
