message: New pkg parser handles usepackage with multiple pkgs
diff: @@ -225,7 +225,7 @@ export class Command {
  if (latexParser.isOptionalArg(arg)) {
  return
  }
  - const pkg: string = (arg.content[0] as latexParser.TextString).content
  + (arg.content[0] as latexParser.TextString).content.split(',').forEach(pkg => {
  const pkgs = this.extension.manager.cachedContent[file].element.package
  if (pkgs) {
  pkgs.push(pkg)
  @@ -233,6 +233,7 @@ export class Command {
  this.extension.manager.cachedContent[file].element.package = [pkg]
  }
  })
  + })
  } else {
  if (latexParser.hasContentArray(node)) {
  this.updatePkg(file, node.content)
  