MacOS Colour Palette

[adamamyl]

There's an existing MacOS color palette theme, but it seems broken / has a few issues that others are suffering from.

So I've made one that works (at least, for now).

https://github.com/adamamyl/macos-dracula-colour-picker

[adamamyl]

existing theme: https://draculatheme.com/macos-color-picker (see RATIONALE.md in my repo for more diags).