title: how to clear all fields including readonly fields in handsontable
body: <p>Iam trying to filter my handsontable based on some criteria. So i would like to reload handsontable based on filter value before that i tried to clear all fields.</p>
  
  <p>All fields gets cleared except <strong>readonly</strong> fields.</p>
  
  <p>Ihave used the following line of code to clear all fields.</p>
  
  <pre><code>      $("#exampleid").handsontable('clear');  
  </code></pre>
  
  <p>Please help me to do the same.</p>
  
  <p>Thank You!</p>