v2 support preview

[mark-wiemer]

Closes #96.

Changes proposed in this pull request:

Breaking changes

• Rename some settings. Users will have to manually adjust these new settings from the defaults to match their old settings:
  • ahk++.file.compilePath is now ahk++.file.compilerPath
  • ahk++.file.executePath is now ahk++.file.interpreterPathV1

Other changes

• .ahk1 and .ah1 extensions now available for v1 scripts, .ahk2 and .ah2 for v2 scripts. .ahk and .ext can be used for either version and still default to v1.
• AHK version now automatically changes to match the #Requires directive near the top of any script the first time that script is opened
• Allow running and debugging v1 or v2 scripts without changing settings
• "Open help" (Ctrl + F1) now opens language-specific help
• Full syntax highlighting for v2 scripts thanks to AutoHotkey v2 Language Support by thqby
• Updated icons (found next to the file's name in the explorer)
  • v2 scripts will have official green icons, while v1 scripts now have modified blue icons
  • Icons are a bit smaller to align with existing VS Code icons

Known issues

Some features are not added to this initial preview release, but will be coming soon!

• Missing features for AHK v2:
  • Formatting (Issue #381)
  • Snippets (Issue #382)

[mark-wiemer]

neat