autorotate: Fix tests
gui: Changes, bugfixes in preparation for 0.4
  - Fix message display
  - Add 'retake capture' button
  - Add review images of last 2 captures
  - Remove 'done' page
Fix workflow test
Rename DeviceFeatures.TWO_DEVICES to CAMERA for better semantics
djvubind: Fixes
tesseract: Silence stdout
Update docs
Update README
Remove 'dummy' device plugin
Update README
Release 0.4