message: Add sectioning snippets
diff: "wrapEnv": {
  "body": "\n\\begin{$1}\n\t${TM_SELECTED_TEXT}\n\\end{$1}",
  "description": "Wrap selection into an environment"
  + },
  + "part": {
  + "prefix": "SPA",
  + "body": "\\part{$1}",
  + "description": "Start a new part"
  + },
  + "chapter": {
  + "prefix": "SCH",
  + "body": "\\chapter{$1}",
  + "description": "Start a new chapter"
  + },
  + "section": {
  + "prefix": "SSE",
  + "body": "\\section{$1}",
  + "description": "Start a new section"
  +
  + },
  + "subsection": {
  + "prefix": "SSS",
  + "body": "\\subsection{$1}",
  + "description": "Start a new subsection"
  + },
  + "subsubsection": {
  + "prefix": "SS2",
  + "body": "\\subsubsection{$1}",
  + "description": "Start a new subsubsection"
  + },
  + "paragraph": {
  + "prefix": "SPG",
  + "body": "\\paragraph{$1}",
  + "description": "Start a new paragraph"
  + },
  + "subparagraph": {
  + "prefix": "SSP",
  + "body": "\\subparagraph{$1}",
  + "description": "Start a new subparagraph"
  }
  }
  