Merge branch 'new-ui'

Merge branch 'master' into 256-fix-next-previous-photo

Merge pull request photonixapp#334 from uraid/master

Fix face and object recognition of rotated images

Test case for invalid UTF-8 metadata

Fixes tests

Merge pull request photonixapp#304 from Red-F/fix-identical-subject-r…

…esilience

never crash when images contain identical subject tags (type Generic)

Tidy-ups to progress bar display

Fix for face recognition on ARM

Pins exact version of opencv-python to fix CI build for ARMv7

Attempt at suppressing tensorflow warnings, tweaking number of raw pr…

…ocessor workers