Allow font selection for profile icons

As it stands right now, profile icons can either be a valid image file or a valid Unicode character (typically Emoji). I was playing around with alternatives, and it looks like that any character in the Segoe font family will play nice, even if updated on a Windows 10 machine to Segoe Fluent. I think that adding the ability to select an arbitrary font for text-based icons would open some doors for people who would prefer to use something like Material or Nerd Fonts for a consistent style and wider range of available icons. It would also have the benefit of scaling on screens better than your average PNG.

Here is a slapdash mockup of what I am describing: