v0.28.0

Changed

• README: the install command clones into ~/.config/dms/plugins; the removed "tracking mode when the
  camera wakes" setting and the "pill is hidden without a camera" sentence are gone (the pill stays,
  dimmed, by default); the popout width states its 720 px minimum; the Framing card's Start mode
  chips are listed. Dead code and a stale comment removed; the Audio card's comment corrected (#102).

Fixed

• Desktop widget: preset and zone view names that start with - can be saved and renamed. They were
  read as an option, so nothing was stored (#103).
• Popout cards: a start mode the widget cannot set (such as hand) no longer shows "Not set"; no
  chip is selected. The stored start pose no longer reads "pan NaN°" while only the mode is known.
  The popout header's status line stays on one line and is elided instead of running under the
  buttons. The hand axis switches stay hidden when the camera's answer has no axis data (#104).
• The startup check now needs obsbot4linux 0.7.3 or newer (0.7.1 and 0.7.2 end zone tracking in Static,
  so "Follow new targets" fails) and refuses obsbot4linux 1.0 and newer, which need widget 1.0 or
  newer. plugin.json requires DMS 2.0.0 or newer, the first version with the modules this widget
  imports. This corrects the minimums stated in 0.19.1 (obsbot4linux 0.7.1) and 0.15.0 (DMS 1.5.0) (#105).
• Presets card and desktop bottom row: without a camera they no longer say "Reading presets…", and
  with obsbot4linux 0.13 an unanswered list shows "Could not read the presets". "Save current
  pose" is enabled only while the camera is live (#106).
• The zone and hand "Return here" buttons and "Save current pose as view" are off while the camera
  sleeps, because the command fails with the pose the camera reports then (#107).