Fixes #1073. Correct nullability for lastDisconnect #1076
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The makes all uses of
lastDisconnectwithinXMPPStreamManagementStoragenullable. This is howlastDisconnectis treated byXMPPStreamManagementMemoryStorage, and there are cases wherelastDisconnectis nil when passed to the delegate (if a disconnect has never occurred). This causes a crash in Swift when the nil is unwrapped.