Unicode guide/Implementations

TODO: organize

- bytestrings (applies to most?)

- bare encoding/runes (java, windows, wchar, rust, go, javascript, ruby, kotlin, zig, elixir)

- codepoint based (python, haskell, perl, tcl)

- grapheme-based (swift, raku) which lets you convert a string to codepoints?

- normalized (raku)

research and categorize the following:

- filesystem/OS APIs being broken?

- surrogates in valid strings (python utf8b)

- bytes in strings? (utf8-c8, utf8b)

- string apis? (encoding/decoding, code points, normalization, graphenes, segmentation, ordering, comparing, breaking, case folding, finding, regex)

- bytestrings

- wchar

- windows

- rust

- java

- swift

- go

- kotlin

- java

- python, utf8b

- tcl

- linux/unix

- javascript

- perl

- ruby

- zig

- raku

- haskell

- elixir

- ICU
 * C and C++
 * Python 2
 * Lua
 * PHP (ignoring mbstring)
 * POSIX APIs
 * Windows narrow APIs
 * DOS APIs