message: Add region markers support
  Allow to use custom code folding markers for latex
  ![Region](https://image.prntscr.com/image/dud1G6E_RRCdi2sJHNi1fg.png "region")
diff: "indentationRules": {
  "increaseIndentPattern": "(\\\\begin{(?!document))|(\\\\documentclass)",
  "decreaseIndentPattern": "(\\\\end{)|(\\\\begin{document})"
  + },
  + "folding": {
  + "markers": {
  + "start": "^\\s*%\\s*#?region\\b.*",
  + "end": "^\\s*%\\s*#?endregion\\b.*"
  + }
  }
  }
  