Setting repair material for Armor is not compatible between 1.10.2 & 1.11.2

[Sinhika]

I can't believe you missed this one when you wrote CompatItemArmor.

• ArmorMaterial in 1.10 sets repair material by assigning to ArmorMaterial.customCraftingMaterial. There is no setRepairItem() method.
• ArmorMaterial in 1.11 uses ArmorMaterial.setRepairItem(itemstack) to set the repair material. There is no public field 'customCraftingMaterial' to assign to; it has been renamed and made private.

See the problem? I solved it by writing a helper method; feel free to cut & paste it into a new 'Tools' class: https://github.com/Sinhika/SimpleCore/blob/dev1.9/src/main/java/alexndr/api/helpers/game/ArmorMaterialHelper.java

Internal comments separate the 1.10 version from the 1.11 version; ask if it's not clear.