Add titles to palette, use palette only

I'd like the ability to add titles to the palette swatch (provided as a json array in palette: options)

Also I'd like the ability to use only the palette, removing the gradient color picker. This allows me to use the same tool for every color picking feature I want to implement.

Start by locating the palette option handling and the palette swatch rendering in this JavaScript color picker. Check how the palette JSON array is currently parsed and how the gradient picker is included. Done means palette entries can expose titles and the gradient picker can be omitted when palette-only use is requested; no file or test is named in the issue.

Written by the indexing model from the issue text.