Color "Book" widget needs refactoring

[Roman Hargrave]

The engineering of the color book widget (the color picker) is such that making changes, repairs, and additions is a complicated process. Much of this is a result of the logic for each color system being completely un-encapsulated.

Where each page of the booklet could implement a class and internalize functionality such as updating sliders and calculated color, each system is implemented as a branch in a function.

Encapsulating color system logic could potentially make it less time consuming to fix issues such as the CMYK, HSL, and HSV sliders "slipping" when adjusted (as a result of their values being derived from RGB - CMYK is a particularly big offender here), or color swatches not updating to reflect values entered in the spinners, rather than the sliders.

[grey tomorrow (gtomorrow)]

Closing because INVALID.

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Closed by: https://gitlab.com/greytomorrow