title: Quill js color textbox
body: <p>I would like to add a textbox for hex/rgb/rgba values in Quill's color options dropbox, so that my users can enter the color value they like, without being limited to the palette offered initially by Quill.js</p>
  
  <p>I tried to use Spectrum ( <a href="https://bgrins.github.io/spectrum/" rel="nofollow noreferrer">https://bgrins.github.io/spectrum/</a> ) in combination with Quill but I failed hard, I could not set/get color values.</p>