Hello Wez o/

I found out about this PR (and its followup) to kitty terminal to add custom branch-drawing symbols, and was wondering if you'd accept a PR to add similar symbols to Wezterm 🤔

(repeating part of that PR here…) These symbols are on an arbitrary range (0xf5d0 - 0xf5fb) in a Unicode Private Use Area that is a reasonable distance from the previous icon set in Nerd icons.

cc @rbong
Would you say the set of chars is final and ready to be impl in other terminals? Or are there more to be added soon™?
I see some discussion about these symbols here, are there other?

related: I'm thinking about first implementing the custom chars 'selector' we talked about a long time ago in 2022…, and these new chars could then be easily disabled if needed 🤔