message: Fix Parse label={...} properly to get references
diff: import * as vscode from 'vscode'
  import * as fs from 'fs'
  import * as path from 'path'
  +import { stripComments } from "../../utils"
  import {Extension} from '../../main'
  @@ -76,8 +77,9 @@ export class Reference {
  }
  getReferenceItems(content: string) {
  - const itemReg = /^(?:(?!%).*\\label(?:\[[^\[\]\{\}]*\])?|label=){([^}]*)}/gm
  + const itemReg = /(?:\\label(?:\[[^\[\]\{\}]*\])?|(?:^|[,\s])label=){([^}]*)}/gm
  const items: {[key: string]: ReferenceEntry['item']} = {}
  + content = stripComments(content, '%')
  const noELContent = content.split('\n').filter(para => para !== '').join('\n')
  while (true) {
  const result = itemReg.exec(content)
  