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Fix color dodge/burn and hard mix softer in brush masking

Deif Lou requested to merge deiflou/krita:deiflou/fix_fp_texture_modes into master

Color dodge/burn and hard mix softer (photoshop) need to clamp the result to the unit range because the color variants can produce greater than 1 or less than 0 values, so special variants were implemented to work well with alpha. Similar to what linear dodge/burn and subtract do.

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