Fix for camera and scissor tool in 'export' mode
Detail: * If the source sprite has an old-style bit mask, solid pixels in the exported sprite's mask may have a different value to the source sprite's. For example 0xFF -> 0xFC. * The OS seems to render such intermediate mask values inconsistently. Applicable GCOL commands have now replaced with OS_SetColour calls (taken from another fix elsewhere in the code that dates back to Acorn). Admin: See also https://www.riscosopen.org/forum/forums/4/topics/14698 Submission for the Paint bounty. Version 2.29. Tagged as 'Paint-2_29'
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