title: Magento 2 - add Multiselect Status in admin Form
body: <p>I am developing a custom module in Magento 2. I would like to add to the editing form a multiselect to allow users to select the status of an order. In Magento 1.9 it is done in this way:</p>
  
  <pre><code>Mage::getModel('sales/order_status')-&gt;getResourceCollection()-&gt;getData();
  </code></pre>
  
  <p>How can this be done in Magento 2?</p>