message: Add more cite/ref snippets
  parencite, textcite, cref, cpageref
  It fixes the textcite issue mentionned in
diff: "snippet":"cite{$1}",
  "detail":"reference",
  "postAction":"editor.action.triggerSuggest"
  -
  + },
  + "textcite":{
  + "command":"textcite",
  + "snippet":"textcite{$1}",
  + "detail":"reference",
  + "postAction":"editor.action.triggerSuggest"
  + },
  + "parencite":{
  + "command":"parencite",
  + "snippet":"parencite{$1}",
  + "detail":"reference",
  + "postAction":"editor.action.triggerSuggest"
  },
  "citeyear":{
  "command":"citeyear",
  "command":"label{...}",
  "snippet":"label{${1}}"
  },
  + "cref":{
  + "command":"cref",
  + "snippet":"cref{${1}}",
  + "postAction":"editor.action.triggerSuggest"
  + },
  "ref":{
  "command":"ref",
  "snippet":"ref{${1}}",
  "postAction":"editor.action.triggerSuggest"
  },
  + "cpageref":{
  + "command":"cpageref",
  + "snippet":"cpageref{$1}",
  + "postAction":"editor.action.triggerSuggest"
  + },
  "pageref":{
  "command":"pageref",
  "snippet":"pageref{$1}",
  