Osm-jet

* Fix a bug where only a the first compact inline would be sortable on a page
* Remove osm_jet/static/edit_inline/compact_inline.js and add the functionality in osm_jet/static/jet/js/src/features/compact-inline.js

* Be less specific about required Django version
* Fix small issue with edit buttons not hooking up on JetSortedManyToMany
* Fix error with adding the first item to a SortedManyToMany
* Fix a Django 2.2 incompatibility
* Make sidebar nav items flow up rather than down if they would go below the bottom of the page

* Add CircleCI builds
* Add copy links for offline page preview URLs
* Fix being unable to re-order CompactInlines on IE11 and Edge
* Add new JetSortedManyToMany field that adds edit buttons to sortedm2m admin fields
* Generally fix an issue with admin field values being added to the hidden form on CompactInlines
* Add preview query string to 'View on site' buttons

* Add ability to add extra links to admin login page
* Add utility templates for adding content to the top and bottom of the body respectively

* Make side menu play nicer with permissions
* Fix a JS exception

* Fix incorrect querySelector in related-popups.js when getting the hidden input for sortedm2ms
* Remove try catch block in related-popups.js that was suppressing errors