Future notes: Non-LTR text in Areas

Need to figure out how to formally support this.

=== RTL Text ===

(TODO)

==== System Default Reading Order ====

(TODO, also a TODO for the rest of libui)

=== Vertical Text ===

**Windows**

Probably blocked until either Windows 7 is dropped or Windows 7 without Platform Update is dropped, whichever the situation is, due to DirectWrite shipping in a blatantly incomplete state for some reason

Font names beginning with @ are vertical in GDI but are not how to do vertical text; they're used to hack vertical text into programs that don't support it — https://blogs.msdn.microsoft.com/oldnewthing/20120719-00/?p=7093