Enhance Access to Color Functions

[jasonacox]

In the discussion #548, it was suggested to promote the functions for hex to HSV and RGB conversions to officially supported methods. This will make it easier to access and use the color functions.

Relevant functions:

• _hexvalue_to_hsv
• _hexvalue_to_rgb
• _rgb_to_hexvalue

These functions are currently used as examples and should be officially supported to enhance usability.