Add Praat scripting language

[JJWRoeloffs]

Adding support for the Praat scripting language. This is a domain-specific language that is quite commonly used in academia for linguistic research, but that isn't that commonly known outside that sphere.

I am not affiliated with the project - I'm just a student who had to learn the language for a BA course, and was surprised github did not support it.

Description

If I did everything correctly, this commit adds support for the Praat scripting language in the way described by CONTRIBUTING.md

Checklist:

• 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 (2.5K files):
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.praat
      • I also added praatscript, praat_script and praat-script, which are less frequently used, but won't likely overlap with anything. I included them because some more common grammars include them example1 example2
      • I'll also list a few projects using this language, alongside their star count:
        • FastTrack (51) - a praat plugin
        • SpeCT (49) - Speech Corpus Toolkit for Praat
        • Praatsouce (21) - Praat-based tools for spectral analysis
        • feelins/PraatScripts (169) - A sample repository containing example scripts
        • stylerw's praat scripts (87) - A repository with the praat scripts this person finds useful for research.
        • fieldDB's praat scripts (50) - Another repository of scripts some researcher found useful.
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample license(s):
      • I wrote these scripts myself as a part of a Research inter-ship, and am happy to re-licence them under linguist's MIT licence (which I am allowed to do following the terms of the internship).
  • I have included a syntax highlighting grammar: URL to grammar repo
  • I have added a color
    • Hex value: #c8506d
    • Rationale: Colour from the logo. The logo has a small gradient, so I picked the colour with the highest contrast out of the gradient to both black and white.

[lildude]

We also need the cached licence file. This should have been created when you used the script/add-grammar script. If you can't find the file, you can regenerate it by running this line manually:

linguist/script/add-grammar

Line 134 in 7ca3799

bundle exec licensed cache -c vendor/licenses/config.yml

[JJWRoeloffs]

I think all requested changes are done.

One question: What are the required steps for data files? Praat saves its data in a number of file formats, but the most notable is .TextGrid, which the vscode extension also has a grammar for. According to the recommended github search, there are over 100K files in this format checked in.

[lildude]

Please remove vendor/grammars/Praat-tmLanguage

[JJWRoeloffs]

Checked everything & updated with master. I think everything is ready at this point.