[feature] Add option to rotate images after scanning

[GregSutcliffe]

Sadly some companies send me documents I need to keep in Landscape format. This causes 2 problems:

1. It's hard to read the resulting images without rotating my monitor :)
2. OCR fails miserably since all the text is sideways on.

In addition, it's not always obvious which is 'up' on some scanners - it's irritating to have to re-scan a document just because you put it upside-down.

Clearly the option to rotate needs to be done before OCR, but it would be annoying to have to check/confirm the image every time (viewing 50+ previews of normal A4 docs would get old, fast). So I propose:

• A new checkbox on the Acquire scan page - Preview Before OCR - defaults to off
• If checked the image is presented to the user, rotation (by 90 degree blocks only) is allowed, and once OKed, the process continues to OCR and beyond.

Make sense?