feat(WG): prioritize native faction, flip only the surplus at war start

[Nyeriah]

Summary

Changes Wintergrasp cross-faction team assignment to prioritize each player's native faction and morph only the surplus needed to even the teams, instead of the previous greedy per-join balance.

The greedy logic decided each player's side from the live in-war counts at accept time, before the final population was known. A minority-faction player who happened to accept the war invite early — when their side momentarily led — could be morphed unnecessarily, and with team-lock that wrong assignment stuck for the whole war.

How it works

On the first join of a war, the native split is snapshotted from Battlefield::GetInvitedPlayersMap (valid at that point: PlayersInWar is empty and nobody is faked yet, since core erases each accepter from InvitedPlayers only after the join hook). Then per join:

• Minority faction → always stays native.
• Majority faction → keeps its fair share (floor(total / 2)) native in accept order; everyone past that — the latest to commit — flips to the other side.

Example: 30 Alliance / 10 Horde queue → all 10 Horde stay Horde, 20 Alliance stay Alliance, the last 10 Alliance accepters are faked to Horde → 20 v 20 with the minimum number of faction changes. The old logic could also flip Horde players depending on accept timing.

It composes with the existing per-war team-lock (lock is checked first, so relogs stay stable) and resets each war via ClearWGWarAssignments().

Config

New CFBG.Battlefield.NativePriority.Enable (default 1). Set to 0 to fall back to the previous greedy balance.

Notes

• Balance is computed from invited counts, so partial acceptance of the war invite can drift teams slightly off perfect 50/50 — still far fewer faction changes than greedy.
• "Latest to commit" is approximated by war-invite accept order; there is no real queue-entry timestamp in core (PlayersInQueue is an unordered set, InvitedPlayers' time_t is the invite-expiry set in a single tick).
• No core changes — entirely within the module, reusing the existing OnBattlefieldPlayerJoinWar hook and team-lock assignment map.

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