Easy Anvils (Backport)

New

• A config switch for each feature that changes vanilla anvils, so a pack can hand any of them back to vanilla or another mod: customAnvilCosts, controlAnvilBreaking, itemsStayInAnvil and longerItemNames, requested by @lordPhantom397 (#1)
• When another mod's mixins change the same anvil classes, the log names the classes and the switch to turn off

Fixed

• A player with too few levels could still take a paid anvil result, reported by @lordPhantom397 (#1)
• Anvils never got damaged on configs made by 1.0.0, which kept a 0.05 break chance. An untouched 0.05 is raised to the vanilla 0.12 once, reported by @lordPhantom397 (#1)
• Items left in an anvil were lost when it chipped, cracked or was repaired with an iron block
• Names longer than 35 characters never reached the item, because the server ignored them