Since we now use a setup component for the calendar the old comments are
no longer relevant and we can use a regular slot.

Steering now creates notes for timeslots automatically.

refs #274 #276

Now that bootstrap-vue is no longer used we can finally deactivate the
Vue 2 compatibility mode.

This is a big one because it’s hard to make these kind of changes
atomic. This changeset reworks the calendar component which is no longer
dependent on bootstrap and vuex.

As a consequence we can remove axios, bootstrap, and vuex because the
calendar was the last remaining part of the code that was still using
them.

refs #127 #140 #261 #279

refs #247

refs #247

refs #247

refs #247

refs #247

refs #254

refs #249

refs #257

We now use the more flexible ErrorDetailArray data structure from
@rokoli/bnb which makes it harder to accidentally ignore or miss errors.

refs #257 #258

refs #257

We currently only have 3 permission’s that we can check. Those are now
implemented.

refs #247

refs #259

refs #241

refs #116

It’s now possible to assign links to shows and notes.

refs #186

refs #135 #104

refs #177

fixes #100

fixes #235

Up until now the dashboard used a hardcoded list of rrules that matched
a long-gone fixture set of rrules in steering. Additionally, rrules were
translated in the dashboard using the the ID of the rrules in steering.
This means that any change to the fixture set, removing an rrule or not
importing the fixture set at all would mix up the translations and
therefore the actual schedules that people would create.

A few months ago the rrules were reworked and an API endpoint was
introduced that exposes the rrules defined in steering. No appropriate
change was made in the dashboard and so the rrule definitions got
out-of-sync.

This change implements a rrule store that fetches data from the API.
Additionally we’ve also implemented a custom rrule to natural language
mechanism [1]. This is because the scope of the rulesets we use in the
AURA radio context is well-known and not to complex and because rrule.js
built-in `toText` function, which might have been an option, is limited:

* bysetpos seems to be entirely unsupported
* internationalization will produce gramatically questionable
  output for languages like German, because the translation
  interface is somewhat lacking.

[1] #226 (comment 13669)

fixes #217