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bz_getPlayerCallsign
const char* bz_getPlayerCallsign (int playerID)
Retrieves the callsign of a player.
Parameters: 
playerID  -  The ID of the player to get the callsign for. 
Returns: 
A string containing the callsign of the requested player.
Example
Display the player's name upon joining.
case bz_ePlayerJoinEvent: {
	bz_sendTextMessagef(BZ_SERVER,((bz_PlayerJoinPartEventData_V1*)eventData)->playerID,
		"Hello %s, thanks for joining this server."
		,bz_getPlayerCallsign(((bz_PlayerJoinPartEventData_V1*)eventData)->playerID));
}break;