message: Make .ltx be treated as LaTeX not TeX
diff: ".sty",
  ".cls",
  ".bbx",
  - ".cbx",
  - ".ltx"
  + ".cbx"
  ],
  "configuration": "./syntax/syntax.json"
  },
  "latex"
  ],
  "extensions": [
  - ".tex"
  + ".tex",
  + ".ltx"
  ],
  "configuration": "./syntax/syntax.json"
  },
  