Paint Tool On Edit Mode

[MinecraftMoments]

Coughdrop, a similar AAC program/website, has a feature in editing mode that allows a user to paint colors over the board, to recolor several elements/buttons at one time. I think this would be a nice feature on Asterics Grid, especially because I'd love to use it during my board editing. It would be a lot easier to have the custom colors be editable in that way.

[klues]

Yes, good idea, it's related to this issue: #299
So maybe I (or anyone else) can implement it along with this issue.

[MinecraftMoments]

yes that would be nice, thank you!
(if needed, you can copy the text from this issue over to that issue so it's kept in the same area)

[klues]

I've linked this discussion in the issue, so I think it's OK.