Created rooms do not appear to those who connect to the server after rooms have been made

Not supposed to let user send messages to themselves

Example

- Client A and B connect
- Client A selects "Send Message to User/Room"
- Client B selects "Send Message to User/Room"
- Client B sends message to Client A
- Client A receives message
- ( Unexpected ) Client A prints prompt

Group message sends to users who used to be in room but are not currently in room (they left the room but still receive group messages from room)

If a client attempts to connect to a non-existent room, they should be alerted with a message.

Relating to issue #5

When user receives message, while in a question, the content of the message is not pushed through.

Example: When a user joins a room, and the event is successful, the "Joined room [room name]" message does not get printed until after the menu prints again instead of before.

Example

- Client A selected "Send Message to User/Room"
- Client A selects incorrect option
- ( Logical Error ) Prompt still continues

If user tries to create a new room and names it "NONE", the program prints out an error message but does not re-print the prompt to let the user continue using the application.

Code modularization of client code (separated one big file into multiple smaller files) resulted in rooms not being saved. The array storing the list of existing rooms is not updating and always reports an empty list.

The array of current users is not updating and when choosing the menu option to list the users, it constantly says "No other users online." no matter how many users are connected to the server.