Ready | Not Ready | Observe is now a three way toggle
The player ready status has been refactored into an ENUM of the three
states, READY, NOT_READY and OBSERVING
if the tickerstate is at least PREGAME they will spawn as observers,
before then you can only register your interest in observing.
All the observer code has been centralised into a single
make_me_an_observer proc on new_player mobs
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