fixes #198

refs #127

refs #127

This refactor includes a bulk of the changes discussed in #181. It
removes the existing navbar and replaces it with a sidebar instead. This
leaves us more room for context-aware navigation options and other
information that is relevant to users.

Additionally, the show management page is now split up into two, the
show episodes management, listing the coming shows/timeslots and the
show’s schedules, and the show basic data page, that contains all mostly
static data for a show and which is usually maintained by
administrators.

refs #181

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 #129

API object attribute names are now:

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

closes #137

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.