Unify color palette configuration data format across all packages and features

[oleq]

Provide a description of the task

A follow-up of #6106.

ATM

• font color defines one format
• table property features use (technically) the same format but under a different typedef
• ColorGridView uses a different format, which is such a pain because each feature must translate editor configuration to the "color grid-friendly format" (which is very, very similar).

We need a single color palette format. For all configurations, under a one @typedef. And understandable for the ColorGridView out–of–the–box.

cc @panr @Reinmar

[panr]

I agree, we have to standardize it 🙏

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