* Backend changes
* Show custom field values
* Add custom fields table input
* Add custom field filtering
* Add unit tests
* Include custom fields in import/export
* Anonymise performer custom fields
* Move json.Number handler functions to api
* Handle json.Number conversion in api
* Support setting nested UI values
* Accept partial for configureUI
* Send partial UI
* Save scan, generate and auto-tag options on change
* Send partials in saveUI
* Save library task options on change
