-Taller icons no longer sink into the tile below on the resize mechanics.
-Living mobs now have a var (vis_height) for their icon height, and humanmob species have a new var (icon_height) that overrides the vis_height for the resize proc.
-Also earlyports some tweaks to ambient occlusion. The new filter system took the old filter's settings as "make the shadows megathick and dummy intense" and that was ugly.
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