* Update Tempus Dominus to v6 (WIP)
* Re-add calendar input prepend container
* Normalize setting of default date values
* Migrate to Bootstrap 5 (WIP)
* Remove deprecated card columns implementation from dashboard
* Update BS5 data props
* Use Masonry layout for dashboard cards (for now)
This doesn't seem particularly ideal so may need a more involved refactor
* Update styles for Bootstrap 5 deprecations
* Remove resolutions crap
* Refactor deprecated BS4 classes
* Update list table styles
* Refactor deprecated jumbotron class usages
* Update close button structure
* Add `v2` branch to standard CI workflows
Makes it so that timline items registered at the same moment are
always ordered "start->end", not "end->start".
Signed-off-by: Paul Konstantin Gerke <paulkgerke@craftware.info>