Add the LiveCode Script language.

[torocruzand]

Description

Adding support for the LiveCode Script language. This language is an integral feature of LiveCode, a cross-platform application development environment.

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*.LIVECODESCRIPT+SCRIPT
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample license(s):
      • MIT License
  • I have included a syntax highlighting grammar: https://github.com/Ferruslogic/vscode-livecodescript/
  • I have added a color
    • Hex value: #0C5BA5
    • Rationale: I chose this color because it is the color of the LiveCode icon.
  • I have updated the heuristics to distinguish my language from others using the same extension. Not required

Changes have been applied. Just pending popularity now.