Item requirements now respect the configuration file.
The 'ItemRequirements' section now also check the off-hand slot.
NOTE: It is possible to quickly remove a required item and replace it without the ability deactivating. I'm aware of this 'issue', but don't think I'll try to remove it. I made the check for required items run 5 times a second instead of 20 on purpose, because I think it's rather heavy compared to the rest of the code. And as long as they place it back within 0.2 seconds, there's no problem, and it allows quick armor switching!