Heroes support

It was hard but I did it. It not direct compatibility with Heroes but it also give protect for "strange" potions effect, like Heroes skills or (maybe) McMMO skills and other plugins.

Sorry for those unreal additions ad deletes, EGit don't like GitHub. I have added only "skills" to config.yml, SuppressWarnings annotations and change effect of DamageCause.Magic by using try-catch.

I hope that pull request will repair a lot of bugs with other plugins.