* Set appearance_flags on HUD images to prevent them from being scaled up/down when the owning mob is macro/micro.
* Optimized the resize() proc and made it adjust the vertical position of the unscaled hud to stay even with the top of the mob's head.
* Also fix the resize proc to be consistent with update_icons(). Now micros wont be in the middle of a turf temporarily after resizing.
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