The enchantmentBlocklist allows specifying a list of enchantments blacksmiths should be blocked from adding to items. Especially curse of binding and curse of vanishing are problematic as the effect is quite bad. Mending is possibly undesirable as it's supposed to be quite rare.
Fixes getting the name of enchantments
Fixes inconsistencies in material and enchantment name-checking
Allows using "null" or "-1" to unset per-material or per-enchantment configuration options
Fixes a bug where basePrice was set to a material name instead of the price for the material being displayed
Adds missing tab-completion for material/enchantment costs
Prevents inconsistencies in deciding if a value is null
