Introduce resizing thresholds

This commit brings deeper changes to the image sizes concept. The goal
was to allow more flexible input in resizing vs. supplied files mixed
mode. Instead of hard <noresize> flags the decision whether to resize
or copy an image is now based on threshold. While not 100% universal,
it brings more control regarding image size bounds. Also brings a level
of tolerance for specific errors (off-by-one exports).

Image sizes' rules are a bit simpler, hopefully easier to understand.
A lot can be achieved by combination of thresholds.

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