Add Lingo language

[JakeSteam]

Description

Adds support for the Lingo programming language, created for Adobe Director.

Note that excluding the biggest contributing organisation, Lingo likely does not currently meet popularity requirements.

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:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.ls+%2F%5Eon%5Cs%5Cw%2B%28%5B%5Cs%5CS%5D*%3F%29%5Cnend%24%2F
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • AutoDismisser.ls
      • Progress.ls
    • Sample license(s): MIT
  • I have included a syntax highlighting grammar: https://github.com/markhughes/vscode-lingo-director
  • I have added a color
    • Hex value: #974413
    • Rationale: Calculated as "average colour" in Adobe Director's logo.
  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

Please add a test for the heuristic

[Alhadis]

Lingo? Holy hell, that's a name I've not heard since 2007.

Lingo likely does not currently meet popularity requirements.

Unfortunately, I'm not sure it ever will. GitHub's code search only indexes files that've been modified or published within the last few years, making it that much more difficult to gauge the eligibility of once-popular programming languages. Because Adobe Director was considered an antique even 15 years ago,¹ it's likely that the majority of Lingo scripts on GitHub are situated in repositories that haven't been touched in a very, very long time.

Footnotes

1. By whom? Well, everybody in my animation class at TAFE, at least. (Hey @dsarajlic, remember Julie's animation class at TAFE? Where we had to animate a scene in a program with a single-level undo history? Good times). ↩

[JakeSteam]

@Alhadis No doubt, I only discovered it because I was archiving / exporting from a 23 year old game 🙂

Just in case it does have some bizarre resurgence (hey, you never know!), I thought the PR would be good practice at Linguist's flow if nothing else!