* Add import-from-asset feature (Closes: #880, #668, #410)
* Limit size of scrollable area to avoid double-scrolling
* Add support for pressing the "delete" key to delete parameters.
* feat: enhance default value field input
* fix: format default value when update type or value on parameters inspector
* fix: don't accept NaN and Infinity for default value setting
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.
