New Ancient Lich baseframe and updated animations by shadowm

This version of the commit removes the orphaned melee attack animation
frame, which is superseded by a 2-frame set. The 1.12.x version of this
commit keeps the file as a copy of the new melee attack animation frame
for compatibility with existing add-ons.

Animation WML and art reference taken from the existing L3 Lich.
Fix Graphics section of the 1.13.0 changelog being out of order