Add formatter directive to disable formatting for a section

[mark-wiemer]

Is your feature request related to a problem? Please describe.
Sometimes the formatter has bugs or does things I just don't like.

Describe the solution you'd like
I'd like to be able to toggle the formatter for specific blocks of code to not edit it. Any code between the ;@AHK++FormatOff and ;@AHK++FormatOn directives should be unchanged. This should work for entire files as well for simplicity.

Describe alternatives you've considered
Right now I have to just disable file formatting entirely with Ctrl+K, Ctrl+Shift+S "Save Without Formatting"

Additional context
Originally mentioned in #585