Loupe 48.rc

- Decide if an image has a format that supports editing based on the reliable mime-type. That way a wrong file extension will not impact the detection of the format being editable.
- Set description instead of title for general errors, showing the complete and correct message.
- Switch to consitently storing rotation with CCW convention.
- editing/crop: Allow do decrease size of crop selection from edges when fixed aspect ratio is used.
- editing: Don't show error if saving is aborted. Instead handle actual errors correctly.

- editing/crop: Change icons for aspect ratio buttons for portrait orientation.
- editing/crop: Disambiguate and tweak icons for crop selection aspect ratio buttons.

Git-EVTag-v0-SHA512: fa3014eb3bfed803fc2dd4221d880c91103a1be25477736f239fbb364d3621ac16647543df54da7290fee7ef9002be6bf2cf76a305a1bd0e06e5f728774c7e92