* add new autofmt sample
* Feat: implement rustfmt::skip support for rsx
* generally improve error handling with better expect messages
* wip: nested rsx formatting and expression formatting
* nested rsx formatting works
* collapse autofmt crate
* cast indent through macros
* use proper whitespace
* no more eating comments!
* Use proper error handling
Adds the ability to specify an indent string to public autofmt methods - either
a sequence of spaces or a tab character.
Get the indentation style and size from rustfmt for dx fmt, or from the editor
settings for the vscode extension.
Closes#1595
Jonathan Kelley