app,libgimp,pdb: add a "drawable_color" PDB group
Which contains all the API from the "color" group, but with a gimp_drawable namespace and with support for high bit depths. The group is actually a copy of "color" with cruft removed and some API ported to using float instead of integer API. Deprecated all "color" functions that already have a ported version in "drawable_color". This is unfinished WIP, some functions in "drawable_color" still have the old API.
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