Enhancements:
- #29 Better error reporting for worker execution failure
- #28 Encrypted email inject must fail if user doesn't have a PGP key
- #26 Deny modification of injects not handled by the worker
- #25 Be able to associate an inject to all audiences
- #23 Hardcode the "from" field of the email module in the settings of the worker
- #14 Add injects which are not SMS or email
- #12 Upgrade OpenEx with a script
- #11 View members of audience in a popup
- #5 Be able to easily disable worker modules
- #3 The token properties should be in "worker management plugin"