[x] I think the first color button should be a rainbow (like this) and bring up an <input type="color"> selector. This will require a bit of special-casing, but shouldn't be too hard.
[x] Add tooltip to that button to explain use (including maybe how to use Select as eyedropper)
Color management:
[ ] Ability to add current custom color to the list of colors
[ ] Should new colors be stored with the room (so sent to others), or local to the user? I imagine local to room (page?) is more useful...
[ ] Re-ordering colors -- locally or for every viewer?
[ ] Removing colors (maybe only custom colors?), similarly
<input type="color">
selector. This will require a bit of special-casing, but shouldn't be too hard.Color management: