Fire Emblem Echoes: Shadows of Valentia - amiibo functionality detailed

- Alm and Celica amiibo allow access to a special dungeon
- write Alm and Celica’s stats to their respective amiibo
- summon them via a special amiibo command as phantoms with their stats based on the scanned version
- other amiibo will be able to be used for summoning phantom soldiers as well
- ties to the new “Mila’s Gear” feature as well