message: Add include and input to snippet commands
  This closes
diff: "vec":{
  "command":"vec",
  "snippet":"vec{$1}"
  + },
  + "input":{
  + "command":"input",
  + "snippet":"input{$1}",
  + "postAction":"editor.action.triggerSuggest"
  + },
  + "include":{
  + "command":"include",
  + "snippet":"include{$1}",
  + "postAction":"editor.action.triggerSuggest"
  }
  -
  }
  