[NCore] Fix a bug in the backup-on-fail for config files. Fix #193
[NEnchantingEgg] Fix Arboricide enchantment. For #70. Fixes #192
* No longer remove unused items
* Now takes 16 Ghast Tears for 2/3 chances vs 32 Ghast Tears for 1/2 chances previously
[NPermissions] First working version of the per-World permissions! Fox #154, adds #186