Merge change 5519

* changes:
  Add a 'removeunusedresources' script that goes through an app and removes all the unused resources. It uses the 'findunusedresources' script to find the resources, and the 'xmlstarlet' command to edit xml files. The result is an uncommitted git change that you can verify, modify if needed, and then check in. Also put some more fixes in the findunusedresources script to keep it from reporting false positives.