Refs #15662 - Add progressbar viewlet

- Add progressbar viewlet near state menu
- Add uninstall profile in order to be able to cleanly remove this
  add-on;
- Add browserlayer in order to show viewlets and all eea.progressbar
  views only if this add-on is installed via Plone Control Panel;
- Add upgrade steps.
Prepare eea.progressbar 1.1.
Updated version for eea.progressbar to 1.2-dev