Library rewritten in Typescript + a few more features

[EnriqCG]

This PR includes some interesting updates (eventually v2.0 of this package).

• Type definitions for rcon-srcds!
• maximumPacketSize has been renamed to maxPacketSize. This is a breaking change.
• No connection is opened when instantiating the RCON class. The socket only initializes after using authenticate(). So you can now define an RCON object without actually opening a connection.
• The last point enables a more powerful disconnect() method. It's now possible to authenticate and disconnect several times without re-instantiating the RCON object.
• New isConnected() and isAuthenticated() methods inside the RCON class.
• Code is now more readable with less unnecessary comments.
• Added ESLint

[c43721]

Leaving a comment as I rely on packages like this to do my server control with a dashboard. A typescript package for this would be in my best interest to use, so I'm wondering if this was dropped.

Please reach out to me in regards to this typescript port, I'm really hoping that this can be released as I see no other TS ports of source rcon implimentation.

Thanks!

[cedricdg]

Would be amazing when this branch can be merged after testing, or at least we can add some types to the regular package.