Add opt-in eviction of disconnected lobby members to free seats - #99
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Adds an opt-in mechanism for the lobby owner to reclaim seats held by members whose connection was lost (e.g. a client crash) without a graceful PFLobbyLeave. When [OnlineSubsystemPlayFab] MemberDisconnectEvictionSeconds is greater than 0, the owner schedules any member reported NotConnected for eviction, cancels it if they reconnect within the grace window, and otherwise calls PFLobbyForceRemoveMember to free the seat. Defaults to 0 (disabled), preserving the SDK's existing reconnect-friendly behavior, so the change is fully additive and non-breaking.
Why this is ideal: without it, a crashed client's seat stays occupied indefinitely, so a full lobby permanently rejects new joins (0x89236227) even though a player is effectively gone — a common and hard-to-diagnose failure in listen-server topologies. This gives games a single, general-purpose knob to reclaim those seats automatically while still honoring the common reconnect case, rather than forcing each title to build its own crash-detection and force-remove logic.