Custom colour names

[georgegillams]

Is your feature request related to a problem? Please describe. It would be really nice to be able to save custom colour name mappings, eg for a company's colour pallete.

Describe the solution you'd like Either a config file that can be loaded containing the custom colour mappings, or some sort of built in storage (or both?)

Describe alternatives you've considered This could be achieved by forking the repo, but would be nice if we could offer the functionality to everyone in a simpler way.

Additional context Happy to contribute if you think this is a good idea!