Implement 'Security Lock' mode

[lokka30]

I want exceptions to be caught during onEnable and put the server into a ‘locked’ mode which doesn’t allow commands to be ran aside from blackwidow, stop, and restart, until the config loads properly, which BlackWidow will then disable the lock.

You can think of similar logic to a firewall: if it is improperly configured, instead of just allowing traffic through on a broken configuration, it's better that it blocks all traffic and allows the admin to repair it.