title: How to modify the csdef defined in a cspkg
body: <p>To deploy to different azure environments I modify the csdef as part of the compilation step to change the host headers. Doing so requires building the cspkg once for each environment instead of being able to reuse the cspkg and specify different configs for deployment.</p>
  
  <p>I would like to instead modify the csdef file of a cspkg after it has been created, without recompiling. Is that possible, and if so how?</p>