ZVISION: Remove dead code
ZVISION: Fix regression from commit 3806aa4418
ZVISION: Limit the default engine delay for all animations

This fixes the lag between frames for all in-game animations
with a default frame delay
ZVISION: Avoid using color masks for in-game animations

This fixes the transparency for some in-game animations. Since colors
can be truncated with color masks, and since accurate colors are
required for transparency, color masks can't be used. This fixes the
transparency of the in-game item examination interface in ZGI