Add option to make "collapsing" feature optional

* View: Prevent collapse/expand depending on config option, add class when enabled
* Config: Add option to view, set default to enabled for new datatypes
* CSS: Revert to normal cursor when collapsing disabled

* Note, this is a breaking change - you'll need set `Enable Collapsing?` to `true` on any existing Archetypes to retain the behavior.
Merge branch 'develop' into feature/allow-collapsing

Conflicts:
	app/views/archetype.html
Hide carets when collapsing is disabled
Merge branch 'feature/allow-collapsing' into develop

Conflicts:
	app/controllers/controller.js