A server running ImmersiveMC should allow clients without ImmersiveMC to connect.

This should also be done vice-versa, but in this case, prevent ImmersiveMC from doing anything. This would fit best with the config system, so I'll work on this issue when I'm implementing that.

Config is done, and we load a "disabled" config before receiving any data from ImmersiveMC. Effectively, everything is in place for this to work, we just need to test it, and probably end up telling Forge that we're fine if the mod doesn't exist on the other network side.