* Move ConfigRevision model & write migrations
* Move ConfigRevision resources from extras to core
* Extend migration to update original content type for ConfigRevision
* WIP
* WIP
* Add git sync
* Fix file hashing
* Add last_synced to DataSource
* Build out UI & API resources
* Add status field to DataSource
* Add UI control to sync data source
* Add API endpoint to sync data sources
* Fix display of DataSource job results
* DataSource password should be write-only
* General cleanup
* Add data file UI view
* Punt on HTTP, FTP support for now
* Add DataSource URL validation
* Add HTTP proxy support to git fetcher
* Add management command to sync data sources
* DataFile REST API endpoints should be read-only
* Refactor fetch methods into backend classes
* Replace auth & git branch fields with general-purpose parameters
* Fix last_synced time
* Render discrete form fields for backend parameters
* Enable dynamic edit form for DataSource
* Register DataBackend classes in application registry
* Add search indexers for DataSource, DataFile
* Add single & bulk delete views for DataFile
* Add model documentation
* Convert DataSource to a primary model
* Introduce pre_sync & post_sync signals
* Clean up migrations
* Rename url to source_url
* Clean up filtersets
* Add API & filterset tests
* Add view tests
* Add initSelect() to HTMX refresh handler
* Render DataSourceForm fieldsets dynamically
* Update compiled static resources
