* Convert sum command into subcommand of the math command * Add bullet points to math.md documentation
str --find-replace
Co-authored-by: Christoph Siedentop <christoph@siedentop.name>
* Str plugin can capitalize. * Str plugin can trim.
Adds new substr function to str plugin with tests and documentation Function takes a start/end location as a string in the form "##,##", both sides of comma are optional, and behaves like Rust's own index operator [##..##].
