Adding new Chat features

[SimobiSirOP]

Short and concise description about my pull request:

• Broadcasts messages to client about joining and disconnecting. Also, implements a chat MoTD.

TODOs:

• [x] - I confirm this PR has been previously tested by me and has no apparent issues.
• [x] - I confirm this PR is complying with this project's Contribution Guidelines.
• [x] - I confirm this PR is complying with this project's Syntax Ruleset.

Longer / More informative description about what my pull request does:

• Allows server owners to send a chat message about Joining and disconnecting.

  Also, this adds a MOTD system.

  Every new feature is configurable. Everything is disabled by default (So it won't bother server owners)

  MoTD allows multi-line implementation. It splits message into several lines, [n] is separator.