uncompressed: support version 1 boxes #1132
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This adds support for parsing uncompressed heif files using version 1 of the
uncCbox, which is a shortcut for simple RGB, RGBA and ABGR files at 8bpp.I looked at trying to synthesize the extra box (
cmpd) at parse time. That didn't work out, because the item property association then didn't line up. Instead, the extra boxes are produced when the item properties are requested.