Combines NBT and hard-coded attribute modifiers

Attribute modifiers for items come in two flavors: NBT and hard-coded. NBT modifiers can be applied through an AttributeModifiers key on-the-fly, while hard-coded modifiers are static for an Item instance.

By default, these modifiers don't mix - the NBT modifiers override the others. For example, a diamond sword with generic.attack_damage +5 would only have that five attack damage and lose the base modifier.

This mod fixes this small issue. It's not really a "bug," more of a bad feature.

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