New theme editor feedback

[Solarunit]

New theme editor in v10 is a killer feature! 👍

I wanted to fix my favorite theme Cucumber Splash for a long time!
The main issue I had with this theme is that playing Artist - Title in playlist wasn't highlighted enough.
And with new theme editor I made a theme copy and changed colors very easy.

Some initial ideas:

1. Theme editor in the fixed window and it overlaps the player so it's hard to see changes in real time
2. I wish we had a list view for themes with their names
3. I think built-in themes should be protected from changes, if user wants to make changes, theme copy should be created.

more ideas incoming..

[Solarunit]

I can't find where to change color for Playlist panel?
"Side Panel" is Album Art panel and not Playlist panel how I thought, confusing..