Add authorisation process for sign ups and allow access to EventDetail for basic users (#399)

* CHANGE: First pass at opening up RIGS #233

Whilst it makes it something of a misnomer, the intent is to make the 'view_event' perm a permission to view event details like client/price. I don't see the point in giving everyone 'view_event' and adding a new 'view_event_detail'...Open to arguments the other way.

* CHANGE: New user signups now require admin approval

Given that I intend to reveal much more data to new users this seems necessary...

* CHORE: Fix CI

* FIX: Legacy Profiles are now auto-approved correctly

* Add testing of approval mechanism

This fixes the other functional tests failing because the user cannot login without being approved.

* Superusers bypass approval check

This should fix the remainder of the tests

* Prevent unapproved users logging in through embeds

Test suite doing its job...!

* FIX: Require login on events and event embeds again

Little too far to the open side there Arona... Whooooooops!

* FIX: Use has_oembed decorator for events

* FIX: Re-prevent basic seeing reversion

This is to prevent financials/client data leaking when changed. Hopefully can show them a filtered version in future.

* FIX: Remove mitigation for #264

Someone quietly fixed it, it appears

* FEAT: Add admin email notif when an account is activated and awaiting approval

No async or time-since shenanigans yet!

* FIX: Whoops, undo accidental whitespace change

* FEAT: Add a fifteen min cooldown between emails to admins

Probably not the right way to go about it...but it does work!

TODO: How to handle cooldown-emailing shared mailbox addresses?

* FIX: Remove event modal history deadlink for basic users

Also removes some links on the RIGS homepage that will deadlink for them

* FIX: Wrong perms syntax for history pages

* CHORE: Squash migrations

* FIX: Use a setting for cooldown

* FIX: Minor code improvements

RIGS/urls.py

@@ -6,7 +6,7 @@ from RIGS import models, views, rigboard, finance, ical, versioning, forms
 from django.views.generic import RedirectView
 from django.views.decorators.clickjacking import xframe_options_exempt
 
-from PyRIGS.decorators import permission_required_with_403
+from PyRIGS.decorators import permission_required_with_403, has_oembed
 from PyRIGS.decorators import api_key_required
 
 urlpatterns = [
@@ -87,8 +87,7 @@ urlpatterns = [
         permission_required_with_403('RIGS.view_event')(versioning.ActivityFeed.as_view()),
         name='activity_feed'),
 
-    url(r'^event/(?P<pk>\d+)/$',
-        permission_required_with_403('RIGS.view_event', oembed_view="event_oembed")(
+    url(r'^event/(?P<pk>\d+)/$', has_oembed(oembed_view="event_oembed")(
             rigboard.EventDetail.as_view()),
         name='event_detail'),
     url(r'^event/(?P<pk>\d+)/embed/$',