Add support for HolyC

[Alhadis]

Continuation of #4277 after it was abandoned by its submitter. @pchaigno already reviewed it and gave it his approval; only script/list-grammars needed to be run to fix the failing tests, but @codingdandy never addressed this and it was closed as stale.

Description

See #4277. I could have added this as a new PR, but Orthodox Easter was yesterday and nothing says "symbolic of Christ" like the resurrection of a PR for God's own programming language.

R.I.P Terry Davis. 💚

Checklist:

Copied from original PR.

• [✝] I am adding a new language.
  • [✝] The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension
  • [✝] I have included a real-world usage sample for all extensions added in this PR:
    • https://github.com/minexew/TempleOS/blob/archive/Adam/Gr/GrAsm.HC
    • https://github.com/minexew/TempleOS/blob/archive/Demo/OnceDemo.HC
    • https://github.com/minexew/TempleOS/blob/archive/Demo/Prompt.HC
    • https://github.com/minexew/TempleOS/blob/archive/Demo/RandDemo.HC
    • https://github.com/minexew/TempleOS/blob/archive/Demo/Spy.HC
  • Sample license(s): Public domain
  • I have included a syntax highlighting grammar: https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fgithub.com%2Fcodingdandy%2Fholyc.tmbundle%2Fblob%2Fmaster%2FSyntaxes%2FHolyC.tmLanguage&grammar_text=&code_source=from-url&code_url=https%3A%2F%2Fgithub.com%2Fgithub%2Flinguist%2Fblob%2F8dab098f75ca838ceff790de5c7f4a950bc44d86%2Fsamples%2FHolyC%2FGrAsm.HC&code=

[Alhadis]

Aaaaaaand nothing says "I'm a moron" like claiming to have fixed something that I forgot to commit and left staged locally. 😀

Lord forgive me.