* feat(general): various notifications improvements
* added API to test notification profiles
* added --http-header to webhook notification configuration
* refactored configuration to always apply defaults before persisting options in the repository
* added 'notification profile show --profile-name=X' command
* more tests
* more test coverage
* report notification code coverage
* feat(cli): send error notifications and snapshot reports
Notifications will be sent to all configured notification profiles
according to their severity levels.
The following events will trigger notifications:
- Snapshot is created (CLI only, severity >= report)
- Server Maintenance error occurs (CLI, server and UI, severity >= error)
- Any other CLI error occurs (CLI only, severity >= error).
A flag `--no-error-notifications` can be used to disable error notifications.
* added template tests
* improved time formatting in templates
* plumb through notifytemplate.Options
* more testing for formatting options
* fixed default date format to RFC1123