Cstat(wall)

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A bitfield for how to draw a wall, as well as a few flags for interaction. Add all together all wanted flag values.

Flag values for wall cstat are:

1 - Make wall blockable
2 - Make bottoms of invisible walls swapped
4 - Align picture on bottom
8 - Flip wall around x-axis
16 - Make wall masking, two-sided
32 - Make wall masking, one-sided
Combine 16 and 32 to disable transparency in the masked texture
64 - Make wall able to be hit by weapons
128 - Make wall transparent
256 - Flip wall around y-axis
512 - Second transparency level (combine with cstat 128)

Unused bits are NOT free for user programming, but are rather reserved for potential future EDuke32 features.