Packet optimisations and improvements

[SquidDev]

There are several performance and security issues with CC's current packet system. All these options should be behind a series of config options as they may break other mods.

• [x] You can send events, shutdown and reboot to any computer on the server. This should be changed to include the container id so only people interacting with the computer can use it.
• [ ] Terminal updates are sent to every player. Could we optimise this so it is only sent to players interacting with it?
• [ ] Terminal updates send the whole terminal each time. Ideally we would send the whole terminal the first interaction and then just partial changes after this. Similarly for monitors.

[SquidDev]

Sadly, when broadcasting terminal state, you have to at least send most of the terminal object (otherwise it deletes it for whatever reason).

Thankfully you don't have to send the actual terminal contents. It should be possible to only send terminal lines to those listening. Possibly only the lines which have changed.

[SquidDev]

Sadly you either have to send the whole terminal or nothing at all. I don't really want to hack the vanilla protocol too much, so this'll have to do.