Description

This PR adds language support for torrc, a configuration file used by tor(1) (and by extension, software that makes use of it, like the graphical Tor Browser).

Checklist

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories.
    • ~1,500 results for files named torrc
  • I have included a real-world usage sample:
    • torrc From lalanza808/monero.fail, MIT license
  • I have included written a syntax highlighting grammar (as usual)
  • I have added a colour:
    • Hex value: #59316b
    • Rationale: The colour features prominently on the project's homepage and throughout its branding.
  • I have updated the heuristics to distinguish my language from others.