Rich Text Editor: New commands and icons

[iOvergaard]

Maybe the "Font size" and "Font select" should use some custom icons to differ from "Text color" which TinyMCE has an icon for in toolbar.

Font size on websites typical has a small/large letter: https://www.flaticon.com/free-icon/decrease-font-size_14631 https://icon-icons.com/icon/font-size/99704

Font select could maybe just be an "A" (or "T"). Some suggestions here: https://fontawesome.com/search?q=font&o=r

I think it would be great the icons represent the same icons in toolbar when possible, but some commands doesn't have toolbar icons. In that case we could use a custom icon.

The "Source code editor" in the ace editor in Umbraco, but it is also possible to enable the "Code" command (the default code editor in TinyMCE), which doesn't seem to be added by default. In older versions of Umbraco both was registered.

Still possible to enable both - in that case I guess it is fine to use same icon for both code editors (unless we could use a slightly different icon for the ace code editor).

Originally posted by @bjarnef in https://github.com/umbraco/Umbraco.CMS.Backoffice/issues/790#issuecomment-1608893879