- Fix plugin start button
      - Change signer prop to match docs
      - Tweaks

      - Fix classpath setting for webapps
      - Implement uninstall args in clients.config

      - Hook up update/delete/check/save buttons
      - Implement delete
      - Hide unless router.enablePlugins=true

      - Check plugin key against all installed plugins
      - Reword some error messages
    * VersionComparator: add '-' and '_' as valid separators
      to better support plugin and java version checking