color: add `HSV` support

[rabsef-bicrym]

See here for an algorithm or investigate others.

Requirements:

• Add %hsv to get and ned, where appropriate.
• Develop a type for get that makes sense with the needs of HSV format
• Write conversion functions HSV <-> RGB (or HSL) and then use extant functions to pad other color-formats when starting with HSV (see HSL start, Hex start).
• Add hsv to all's output and fix lo-abet to produce it.