Some fixes and configuration improvement.
[+] = Added features
[-] = Removed features
[/] = Changed features
[?] = Experimental features
[/] Fixed the issue where villagers could not take damage. (Thanks
Acrothetics)
[+] Added controller for config file. (Against possible misconfiguration.)
[/] Default config settings changed. (block-zombie-villager-cure: false -> true)
[/] Minor fixes.