Add disabled commands to config

[srnyx]

What and How?

Make the list of disabled commands configurable in config.

Why?

To add/remove commands you need to edit the code of the plugin.

Are there alternatives?

Editing the code and then updating the plugin.

Checks

• [X] I have used the search at least once to check if my idea has already been suggested and perhaps already implemented.

Anything else

Reference: https://github.com/commandgeek/geeksmp/blob/8cd9daea1987ebaed365cc10bc841608786b2d36/src/main/java/com/commandgeek/GeekSMP/listeners/CommandListener.java#L25