* 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
