Discovered flight paths are now shared across all characters on the same
Battle.net account. On login, each character merges the account-wide taxi
mask into their own. When a new node is discovered, the account mask is
updated immediately. Nodes with TaxiNodeFlags::NotAccountWide are excluded.
- Add warband_taxi_mask table (one row per bnet account)
- Add PlayerTaxi::MergeAccountTaxiMask() and LoadTaxiMaskFromString()
- Merge account taxi mask during Player::LoadFromDB
- Save character's merged mask back to account on Player::SaveToDB
- Update account mask on SendLearnNewTaxiNode/SendDiscoverNewTaxiNode
luis
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