Show assistant custom colors at the bottom of their on-canvas editor

Carsten Hartenfelsrequested to merge
hartenfels/krita:feature/assistantcolorstrip into master

Assigning a custom color to an assistant shows that color at the bottom of its editor widget. Presumably if you're using custom colors, you have a bunch of assistants and want to be able to tell them apart, so this seems like the right thing to do. The strip is only there for custom colors, the global-colored assistants get no strip. The opacity of the strip is always 100%.

K-A thread: https://krita-artists.org/t/show-custom-colour-on-assistant-hover-bar-ui-improvement/188002

Assistant custom colors at the bottom

Test Plan

Create assistants, change their colors and opacities.

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
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  • I made sure my code conforms to the standards set in the HACKING file.
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  • Does the patch add a user-visible feature? If yes, is there a documentation MR ready for it at Krita Documentation Repository?

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