title: Change the type of a variable everywhere in the workspace
body: <p>I have a variable that is of a certain type (<code>TreeViewer</code>). I decided that I would now like this to be a different type (<code>TableViewer</code>).</p>
  
  <p>This variable is mentioned in a lot of places and I would like to change it to a different type (<code>TableViewer</code>) in a lot of places. </p>
  
  <p>Is there a quick way to do this in Eclipse?</p>