Refs #654 -- API: Writable event endpoints (#756)

* MKBDIGI-185: Added update/create to events

* MKBDIGI-185: Added validation for 'slug, 'live' on event endpoint

* MKBDIGI-185: Code formatting

* MKBDIGI-185: Added 'plugins' to 'event' endpoint

* MKBDIGI-185: Merge migrations

* MKBDIGI-185: Cleaned up static methods

* EBILL-5: Added delete endpoint for event

* EBILL-5: Merge migrations

* EBILL-5: Fixed imports

* EBILL-5: Changed plugins to only list plugins enabled for the event

* EBILL-5: Added clone event endpoint

* EBILL-5: Removed permissions check API test for events

* EBILL-5: Merged master, updated migrations

* EBILL-5: Updated api permissions check for CRUD on events

* EBILL-5: Removed 'unique_together' constraint on event model

* EBILL-5: Removed call to changed static methods in test

* EBILL-5: Changed Event 'has_paid_things'  to a property for consistency

* EBILL-5: Fixed created response code in documentation

* EBILL-6: Documentation fixes

* EBILL-6: Fixed typo

* EBILL-6: Fixed permissions

* EBILL-6: Added note on copying settings to documentation

* EBILL-6: Created model method for deleting sub objects on event before delete

* EBILL-6: Fixed typo

* EBILL-6: Re-added meta_data as read-only

* EBILL-6: Fixed permissions test

* EBILL-6: Added plugins issues check before live. Moved issues property from form to Event model.

* EBILL-6: Upped version number in documentation

* Add write support for MetaDataField

* EBILL-6: Expanded documentation for the clone endpoint, made behaviour of 'is_public' similar to 'plugins' for consistency

* EBILL-6: Re-added EventCRUDPermission

* EBILL-16: Updated documentation with permission model for the API

* EBILL-16: Added 'has_subevents' validation to ensure it cannot be changed once event is created.

* EBILL-16: Fixed event clone not differentiating between "not set" and "deliberately set to False"

* EBILL-16: Fixed event live validation

* EBILL-16: Added logging of live activated/deactivated

* EBILL-16: Fixed create event bug when no 'meta_data' supplied

* EBILL-16: Typo fixed

* EBILL-16: Added log display for "event created"

* EBILL-16: Enabling a plugin now calls 'installed' if applicable and log entries are added

* EBILL-16: Updated tests for events

* Do not allow enabling restricted plugins via the API

* Remove unused code

src/tests/api/conftest.py

@@ -27,7 +27,8 @@ def event(organizer, meta_prop):
     e = Event.objects.create(
         organizer=organizer, name='Dummy', slug='dummy',
         date_from=datetime(2017, 12, 27, 10, 0, 0, tzinfo=UTC),
-        plugins='pretix.plugins.banktransfer,pretix.plugins.ticketoutputpdf'
+        plugins='pretix.plugins.banktransfer,pretix.plugins.ticketoutputpdf',
+        is_public=True
     )
     e.meta_values.create(property=meta_prop, value="Conference")
     return e
@@ -60,6 +61,7 @@ def team(organizer):
     return Team.objects.create(
         organizer=organizer,
         can_change_items=True,
+        can_create_events=True,
         can_change_event_settings=True,
         can_change_vouchers=True,
         can_view_vouchers=True,