SOCPlayerClient + stub handleSIMPLEREQUEST
_SC_PIRI: Handle Pirate Fortress Attack result messages at client
_SC_PIRI: SOCGame +removeShip, adjust attackPirateFortress return
_SC_PIRI: srv.handleSIMPLEREQUEST: call ga.attackPirateFortress, report results
_SC_PIRI: Clients handle REMOVEPIECE messages