Replace structs of Dep<Service> with OnceServices, so each service has a Services reference
Remove service name => Service map
Flatten Services.rooms
Make reqwest Clients lazy initialized (client service)
Abstract Pdu unsigned accessors into trait Event.
Abstract Pdu relation related into trait Event.
Abstract PDU content into trait Event.
Move event_id utils from pdu to event.
Signed-off-by: Jason Volk <jason@zemos.net>
