Part of STUD-847.

minShown = 1250, closeIcon = false

Models are extraneous for something as temporary as a notifaction -- this change
moves all the configuration into the views, and removes the models entirely.

Also, a SystemFeedback model no longer has a `type`, it has an `intent`. This is
because SystemFeedback views have `type`, as well, and this prevents a naming
collision.

Doing so overrides the AJAX error popup

Model shouldn't know about things like close buttons, visibility, and so on