Rename faerie unit types' WML files to match AtS
Rename 'images/units/faeries-sylvan' to 'faeries' to match AtS
New baseframes for the Faerie Sprite line, from AtS
Simplify animation WML in MELEE_FRAME_FIRE_AURA
Simplify animation WML in BURST_FRAME_FAERIE_MYSTIC_FIRE
Simplify animation WML in MISSILE_FRAME_FAERIE_MYSTIC_FIRE
Convert units in the Faerie Sprite line to the simplified 1.12 animation syntax