title: How to create dynamic fields in visual composer?
body: <p>I am creating visual composer plugin for price table. I want to add dynamic textfield so user become able to add multiple text fields for item list as want.
  For now it's showing only one text field but user should able to add multiple fields.</p>
  
  <pre><code> array (
      "type"          =&gt;  "textfield",
      "heading"       =&gt;  __( 'List Items', 'pt-vc' ),
      "param_name"    =&gt;  "price_list",
      "description"   =&gt;  __( 'Write the list item that you offer', 'pt-vc' ),
      "group"         =&gt;  'List Item',
   ),
  </code></pre>