factor out string_ext.lua

[naturallymitchell]

foundpatterns/varexpand.lua foundpatterns/string_split.lua

• [ ] replace uses of string:capitalize with heck.whatever()
• [ ] move expand to a separate project
• [ ] move string_split () to a separate project

[Arnaz87]

Responses in the same order

• what the hell does that mean?
• yep, but expand is not as useful when it can't reference local variables
• how so? it's not a big function, it's perfect for a string extension library (the module itself basically), way too small for a whole dedicated library for it

[naturallymitchell]

varexpand and split don't go together. neither is too small for a "whole dedicated library". there's nothing wrong with small libraries.

https://github.com/foundpatterns/lighttouch-base/blob/e51b8a10825bb227933310934018f21de0da8cc8/string_ext.lua#L47-L49 => https://github.com/foundpatterns/torchbear/blob/master/src/bindings/string/heck.rs#L28-L30