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Adds linting support for dub.json/dub.sdl schema for dependency git commits:

"dependencies": {
  "dmd": {
    "repository": "git+https://github.com/dlang/dmd.git",
    "version": "c60fe8e075fb01c4fa510953c13d6e1e10f79671"
  }
}

dependency "dmd" repository="git+https://github.com/dlang/dmd.git" version="c60fe8e075fb01c4fa510953c13d6e1e10f79671"

Fixes CI generated .vsix files (and released extensions with that) not including debug plugins, possibly causing task debugging issues.

• fixes which compiler is used with serve-d installation (when compiling from source)
• adds debug settings "d.forceUpdateServeD" and "d.forceCompileServeD"

refer to CHANGELOG.md

Added electric characters & closing character pairs (fix #10)

Added auto complete for dub.json files