[Feature] Make the hair color field a multi-value field

[echo6ix]

Is your feature request related to a problem? Please describe.
A lot of performers use a different hair color throughout their career, but only allowing one option limits us to just one hair color. If Jane Doe has brown hair in three scenes, and blond hair in three scenes, her hair color should be defined as both blond and brown.

Describe the solution you'd like
Make the hair color field a multi-value field. That is, let a performer have more than one hair color.

Additional context
I'm not sure if the various option is applicable here or if it's for performers that have multi-colored hair. Either way, it would be really vague to select various for every performer that has used different hair colors throughout their content.

[echo6ix]

Additionally,

• Add more basic hair color values
• Modify the spelling of some existing hair colors to be gender neutral
• Sort fixed list of hair colors alphabetically

List of new recommended hair colors (these would cover basic synthetic hair colors, excluding white):

Hair color
Blue
Green
Purple
White

List of existing hair colors and their modifications:

Hair color	New value
Blonde	Blond
Brunette	Brown
Various	Multicolor

I think this covers the fundamental basic and artificial hair pigments without getting into all the variations. The only basic color I omitted was Vibrant Red (or a better term for an artificial red pigment) to differentiate from a natural red pigment. But I'm not sure anyone cares about that level of detail.

[sleetx]

I think "Various" is a better descriptor than "Multicolor"... "Various" indicates that the performer has used multiple hair colors during their career. "Multicolor" to me just indicates some sort of rainbow dye.

For artificial colors, what about a generic "Neon" color instead of listing out every possible option (green, blue, pink, purple, etc)?