Changed the on content load direct method call to event

This change allow extending the on content load easly.
fixes #3274 moved config template to the new two-pane and add full screen editing
fixes #3140 - API to allow importing of puppet classes
fixes #3138 - move CR library loading into initializers, only show available providers
fixes #3266 - ensures there are no duplicate notifications
fixes #2763 - correcting doco links