added default constructor to servertoclient data, made the client die when the server dies
both server and client recognize another client's disconnection
Merge branch 'master' of https://github.com/twcus/CS354r-Whirlybirds

Conflicts:
	Heli.h
clients can now reconnect after disconnecting without needing to restart server
Merge branch 'master' of https://github.com/twcus/CS354r-Whirlybirds