internal note and show owners are both admin-controlled.

refs #146

refs #146

refs #146

The ComboBox is now generic (both in the sense of TypeScript generics as
well as use in other areas as the show selector). It’s behaviour now
also aligns with te TagInput component.

refs #146

refs #121

refs #129

Submitting a note would sometimes fail but user’s were not informed that
something went wrong, because errors not mapped to any form fields were
not displayed.

API object attribute names are now:

1. camelCased (#164)
2. use Id / Ids suffix for object references (#172)

closes #137

refs #127

closes #141

refs #89

refs #89

We don’t want to show schedules that are in the past because they
clutter the overview.

refs #120

Schedules that only run for a single day should display when that day
is.

refs #121

closes #133

We’ve decided to move the show selector into the navbar because the
selected show is the primary state of the dashboard from which almost
all other state is derived.

Apart from that we now have support for filtering the list based on
active and inactive shows (and possible other criteria in the future) as
it was suggested in #122.

This re-implements the auth store with pinia.

Other notable changes:
* the OIDC client configuration and setup is now part of
  separate module that can be included by the OIDC callback routes
  and ensures that we always use the same OIDC client configuration.
* Authorization headers for the steering and tank REST APIs are now
  set with an axios interceptor instead of specifying them for each
  API store action.

refs #127

The show selection mechanism relied on the parent component to notify
other components, even though the selected show is already part of the
store and all component state can and should be derived from there.

This is a stopgap measure until we’ve worked on #17 [1] and added a
management interface for simple models like funding categories and show
types.

refs #97

[1] #17

Tank only returns an entries property for playlist objects if the
entries list would have at least one item. This is a bug [1].

closes #119

[1] tank#46