title: Query items user was mentioned in
body: <p>Is there a way to query work items where a user was mentioned? I am able to receive 'hard-coded' results by querying for</p>
  
  <p><strong>"History"-"Contains word"-"\@Username"</strong>,</p>
  
  <p>but I want a generic version, which works for all users. (Opposed to writing one query for every user)</p>