FR: use rgb color ranges for the color key instead of hex values

[chrisgrieser]

Reference: https://discord.com/channels/686053708261228577/928964558721265694/962281335135821864

Having, say, a dozen possible values instead of the 256^3 values of hex would make it much easier to build some stuff around highlight color automation.

[argenos]

Optionally: settings to define which colours to recognize/use which can also be something customised on most PDF viewers.

[mgmeyers]

Annotations now have a colorCategory property that's one of:

Black
White
Gray
Red
Orange
Yellow
Green
Cyan
Blue
Purple
Magenta

It uses the same approach as zotfile. Does this work for your use case?

[chrisgrieser]

yeah, I think that should work. 🚀