FossilsPlus Addon: ATM x MSD (LegendaryMonuments variant)

Changes Mewtwo resurrection to use:
- minecraft:nether_star
- legendarymonuments:tuft_of_mew_hair

Also updates FossilsPlus modifier variants for Mewtwo to use the tuft instead of cobblemon:psychic_gem.

Includes an override fossil definition:
- data/cobblemon/fossils/mewtwo.json

Important:
- Enable this datapack *instead of* the vanilla ATM x MSD addon datapack. Do not use both.

Other ATM x MSD recipes (Genesect, Type:Null) are unchanged.
