Add GFK_TCP_FLAGS setting to allow customizing TCP flags used in
violated TCP packets. This addresses cases where different flag
combinations (e.g. 'S', 'RA') may work better for certain networks.
Changes:
- Add tcp_flags parameter to vio_server.py and vio_client.py
- Add GFK_TCP_FLAGS to settings save/load with validation
- Add TCP flags menu option in change config for both server/client
- Default remains 'AP' for backwards compatibility
Validation: Only uppercase TCP flags allowed (F,S,R,P,A,U,E,C)
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