String Additions

String capitalization. Index-based insertion, replacement, and removal. Similar implementation of C# String.Format(..) to allow for terse index-based string interpolation without needing to use a literal with '$var' at the time of interpolation.
`capitalize` capitalizes the first letter of each word in a given string.

Question: is it worth noting that for characters that have no capitals (e.g. Chinese, Japanese, Korean) that it does nothing? Maybe that's already pretty obvious?