Moved data structures keeping track of users, chats, chat members to the clientside class rather than the guis
Created single instance of printwriter and buffered reader for client side threads, rather than creating a new one on each call
Merge AllUSersGUI and COnversation GUI
Merge pull request #13 from gabofratta/master

NEED TO MERGE THIS! - moved data structures keeping track of users, chats, chat members from guis to clientside class / created single reader, writer for clientside threads