Thermoo

Adds a new armour materials API to sort of replace the primary use case of the old item attribute modifiers API.

• Added new armor material tags for different levels of frost and heat resistance. Note that these are tags for armor materials, not armor items, and therefore go in data/<namespace>/tags/armor_material/.
• Added two new events: ArmorMaterialEvents.GET_HEAT_RESISTANCE and ArmorMaterialEvents.GET_FROST_RESISTANCE to get the respective heat and frost resistance for an armor material and armor type (like boots, chestplate, helmet).
• Known issue: Using the tags to apply heat and frost resistance doesn't really work with a datapack's normal world-independence. For now, the tags should only be used in datapacks that apply to all worlds on a modpack/server.