Change all of the MessageSendingOperations<String> usages to
SimpMessageSendingOperations since that has the send to user method.
Instead of generating the personal chat id, just use the send to use
method and subscribe to the chat channel using the queueSuffix.
Change IN_PROGRESS enum value to INPROGRESS.
Add logic to the server to change game stages and send out updates to
all clients in the game.  Wire up the front-end to switch to the joined
game after the user is confirmed on joining.  Also added some css styles
to distinguish the games based on what stage they are in.