title: Jenkins edit config in multi-branch pipeline
body: <p>I cannot find a way to edit the configuration of multibranch pipeline projects. When I change to the branch level, there is only a "view configuration" menu item, as opposed to ordinary pipeline projects. </p>
  
  <p>I am looking for a method to configure build triggers from outside Jenkins. My current workaround (define a pipeline per branch) is not feasible beyond initial testing.</p>