Tracking Issue: Text tool and typography improvements

- [x] Searchable fonts (#1499)
- [x] Line height (#2016)
- [x] Character width (#2016)
- [x] Wrapping text boxes (#2118, #2176)
- [x] Faux italic (#2739)
- [x] Bidirectional text (#2739)
- [x] #2351
- [ ] #978
- [ ] Style spans (so users can have a bold word in a paragraph of regular text or one word a different size/color/font than other words).
- [ ] Move text editing to be fully handled by the editor (currently an input box is displayed and the text is hidden). An initial prototype exists at #1589.
- [ ] Ligatures
- [ ] Faux bold
- [ ] Font fallback for other scripts (probably Noto Sans / Noto Serif seeing as we can't access the filesystem).
- [ ] Advanced styling options
- [ ] Inline graphics (other graphical content pasted as glyphs in the text flow)