Updates the CMS profile page and SecurityAdmin to give developers a few ways to customise the required fields.
Added extension hook updateValidator for getValidator for things like modules to inject required fields to go along with Injector for replacing the entire class for project specific use.
CMSProfileController currently checks canView() which ensures that a logged in CMS
Member can access the profile controller, but when saving the record on Member_ProfileForm
there is no check for canEdit(), so extended permissions don't get respected.
This adds a check for canEdit() in Member_ProfileForm, and adds some functional tests
to check permissions.