Render the timeslots as an editable table of times with associated
event. When the event it's linked to is edited the time slot is removed
from the original event it belonged to and added to the possibly new
event it now belongs to. This gives a somewhat intutive editing
experience when editing time slots linked to events with multiple times.
Add allowedAccountTypes page metadata which the authenticated middleware
uses to further restrict the types of accounts that can access the page.
If the account type is insufficent to access the page it will return an
HTTP 403 Forbidden status, which is rendered using the error page.
