pdPreferences: new Color Management Performance preference

I am loathe to add new features (and particularly text) to this build
when it's so close to release, but this is an important one.

It has come to my attention that color management settings derived from
Windows' built-in "color calibration" tool can absolutely destroy ICM
performance.  (e.g. When active, all tool previews and viewport
navigation slow to a crawl.)  That tool is a bit of a joke, anyway, as
you can't calibrate a monitor just by looking at it and clicking colored
boxes that "look nice"!

Regardless, we can mitigate the performance hit a bit by modifying the
quality of our multiprofile color transformation.  This is only a
stop-gap toward a better solution, but it's important enough to add to
6.4, I think.
Color Management: tie transform quality into new color management performance preference

See previous commit comment for details