Changes

Current options for managing add-ons installed by third parties and system administrators are limited. We allow disabling but not uninstalling. We also currently do not provide adequate warning to users that new third-party provided add-ons have been installed.

** Users should be able to opt out of such add-ons before the add-on's code haa has a chance to run* Allow uninstalling third party add-ons in some way** Consider how to allow "reinstalling"