Complete overhaul of module

Many changes in terms of following conventions and standards.
as well as:
 * Create empty collection policies.
 * Deleting collection will also delete children that have no other parents.
 * Reverted back to the old management interface.
 * New child collections uses defined parent namespace.
 * Any operation performed on more than one object is now batched.

Probably some other stuff.
Removed the Change Content Model's Form.

As per:
https://jira.duraspace.org/browse/ISLANDORA-851

Also:
 * Updated the permissions test to reflect these changes.
 * Coding standards for .test files
 * Fixed bug with Create Child Collection Permissions.