title: Get current action in CakePHP 3
body: <p>In CakePHP 2 I could get the current action by using <code>$this-&gt;action</code>, but in CakePHP 3.x I can't use this anymore, as it returns the following error:</p>
  
  <pre><code>Error: actionHelper could not be found.
  </code></pre>
  
  <p>How do I get the current action in CakePHP 3?</p>