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 #155 #156

Duration strings may return an awkward format if the seconds it is
calculated from were fractional. A single second is the maximum
precision we want for a duration string so we can simply round them in
order to avoid such cases.

refs #155

refs #127

fixes #153

refs #173

refs #151

refs #156

refs #129

refs #126

refs #154