Add event checkin functionality, seperate power tests into a different form (#536)

* Split power related parts of event checklist into a seperate form

* Revamp H&S overview, remove individual lists.

They were not a good thing.

* Remove old 'vehicle/crew' stuff

* Very initial version of checkin form

* Further work on checkin, add role field etc

* Fix tests after form split

* Add ability to edit checkins, more validation

* Basic checkin/out logic complete

* Add homepage checkin for events happening now

* Minor improvement to homepage UI

* Checkin button turns into checkout button where applicable

* UI work

* Clicking check out does not redirect the user

* Register check in model with the admin site

* Add power record status chip, checklist status chip displays number of checklists

* Minor fixes

* Implement codedoctor suggestions

* pep8

* Add data migration for crew/vehicles

* Checkin only requires login (no perms) and block users from editing other checkins at Django level

RIGS/admin.py

@@ -20,6 +20,7 @@ admin.site.register(models.VatRate, VersionAdmin)
 admin.site.register(models.Event, VersionAdmin)
 admin.site.register(models.EventItem, VersionAdmin)
 admin.site.register(models.Invoice, VersionAdmin)
+admin.site.register(models.EventCheckIn)
 
 
 @transaction.atomic()  # Copied from django-extensions. GenericForeignKey support removed as unnecessary.
@@ -206,3 +207,8 @@ class RiskAssessmentAdmin(VersionAdmin):
 @admin.register(models.EventChecklist)
 class EventChecklistAdmin(VersionAdmin):
     list_display = ('id', 'event', 'reviewed_at', 'reviewed_by')
+
+
+@admin.register(models.PowerTestRecord)
+class EventChecklistAdmin(VersionAdmin):
+    list_display = ('id', 'event', 'reviewed_at', 'reviewed_by')