Make sure popper frontend dependency is always loaded before bootstrap script files load
This fixes #121 as well as issues in admin interface (scheduling and track management)
Make track management javascript more robust (this resolves an issue occurring when moving an AK with track back to list of AKs without tracks)

Benjamin Hättasch authored 4 years ago and Nadja Geisler committed 4 years ago

Introduce writable API for events (protected)
Implement change callback function in javascript
Use full version of jquery in admin backend (to make ajax functionality available)

This is the base for custom admin views (with admin design and permission checking)
Replace default admin site with custom admin site in AKModel
Use custom admin index template & apply first basic change
Introduce custom admin base template (including bootstrap loading)
Introduce Mixin for AdminViews