title: JavaParser AnnotationExpr get parameters
body: <p>I have an <code>AnnotationExpr</code>, how do I get parameters and their values of the annotation (e.g. <code>@UnityBridge(fullClassName = "test")</code> - how do I obtain a value of <code>fullClassName</code> parameter). Does JavaParser support this? </p>
  
  <p>Do I have to accept another visitor? Which one in this case?</p>