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Add support for ILBM "Hold and Modify" mode images

Alx Sa requested to merge alxsa-ilbm-hold-modify into master

This patch attempts to add support for importing ILBM images with "Hold and Modify" mode set.

In this mode, the last two bits in a plane are used to determine if a palette color should be used - or if the prior pixel value should be modified to create a new color (by replacing either the red, green, or blue channel with the plane bits).

This supports HAM 5/6/7/8 modes.

Edited by Alx Sa

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