mcresources 1.6.0

This update tracks 1.20.1, pack format 15.

Changes

• Add py.typed marker, as per PEP-561
• Add mcresources.atlases for the new atlas system.
• Add some helpers to advancements.
• Update loot_tables methods to use any_of, all_of, etc.
• Add ResourceManager#block_and_item_tag