Fixes PL2 generation#3

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muitdebos wants to merge 4 commits intoOpenDiablo2:mainfrom

muitdebos:main

Commits on Feb 9, 2022

Fix encoding of TextColors using 3 bytes
Ingmar uit de Bos
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Fix TextTransform colors due to double multiplication and single division
Ingmar uit de Bos
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Fix generateRGBTransforms with proper color ranges
Ingmar uit de Bos
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Fix multiplicative blend and clean up comments
Ingmar uit de Bos
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