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.
Developer information
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