Ignore functions regex

[silverwind]

I would like to allow certain functions like color-mix, but it seems the current ignoreFunction option is not flexible enough.

This should be flagged:

color: rgb(255 0 0);

This should be allowed:

color: color-mix(in srgb, var(--color-red), var(--color-blue));

Maybe have an ignoreFunctionRegex: /^color-mix$/ option?

[Zeeex]

I would also like this option, and you could probably re-use the same keyword, like for "ignoreValues"

Something like this:

"ignoreFunctions": {
	"": false,
	"/RegExp/[darken]": true,
	"/RegExp/[lighten]": true
},