- move user-preferences to edit submenu
- unify user preferences with other forms
- use light fieldset for all user-edit-forms
- support offcanvas elements
- allow to dynamically inject toolbar buttons (via plugins)
- use interface for formatting dates
- improve docker issue template
- bump version and composer packages
* bump version
* ignore .disabled for plugins
* simplify gitignore
* prevent duration field from showing up in the API
* change release template wording
* prepare method for later usage
* add 8.2 to issue template
