Add language: LPC

[jlchmura]

Description

This PR adds syntax highlighting for the LPC language, a C-like language used in MUD drivers such as LDMud and FluffOS.

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*.c+%28%22this_player%28%29%22+OR+%22this_object%28%29-%3E%22%29
        Note: While this search does show widespread use of LPC, it understates the popularity of the language. The nature of most mudlibs is such that they are stored in private repos.
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/jlchmura/lpc-language-server/blob/main/server/src/tests/cases/compiler/
    • Sample license(s):
      • MIT
  • I have included a syntax highlighting grammar: https://github.com/jlchmura/lpc-language-server/tree/main/syntaxes
  • I have added a color
    • Hex value: #ffb100
    • Rationale: It is reminiscent of the amber screens that were in use when many MUDs got their start
  • I have updated the heuristics to distinguish my language from others using the same extension.

[jlchmura]

Note to the maintainers: I was not able to write a heuristic that could handle samples/c/nightmare.h since C and LPC are so similar in that regard. Do you recommend removing LPC from the .h extension, and let the user override via gitattributes linguist-language?

[jlchmura]

This PR will close #7178

[jlchmura]

@Alhadis @lildude Can you add this PR to your to-do list to review?

[lildude]

Please review your regexes to ensure they run linearly and do not suffer from ReDoS... your lpc pattern definitely suffers from ReDoS.

Please also update your sample to only include real-world examples. Several of your samples are contrived just to validate the syntax highlighter. Additionally, the sample that is suppressed in the diff indicates it's too big for our needs so will need removing or reducing.