Fix small java client server app

Client can export the chat history of their current session (client-side)
Client’s mute list will persist across sessions (server-side)
Based on username match
Clients will receive a message when they get muted/unmuted by another user
(i.e., Bob muted you)
This message should only be sent if muted becomes unmuted or unmuted becomes mute, it’s not an opportunity to create a spam mechanism
The user list should update per the status of each user
Muted users appear grayed out
Last person to send a message gets highlighted