`CollectionState.update_reachable_regions()` un-stales the state for all
players, but when checking `OOTRegion.can_reach()`, it would only update
OOT's age region accessibility when the state was stale, so if the state
was always un-staled by `update_reachable_regions()` immediately before
`OOTRegion.can_reach()`, OOT's age region accessibility would never
update.
This patch fixes the issue by replacing use of CollectionState.stale
with a separate stale state dictionary specific to OOT that is only
un-staled by `_oot_update_age_reachable_regions()`.
OOT's collect() and remove() implementations have been updated to stale
the new OOT-specific state.
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