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C048: The doorway's nudge routines, by the pillar's facing
Four words indexed by the first pillar's facing (GET_SPRITE_DIR, used by FIRST_PILLAR): 0 and 1 not mirrored, 2 and 3 mirrored. A pillar is graphic 2, whose bit 2 is clear, so only entries 0 and 2 are ever used; 1 and 3 repeat them.
NUDGE_ROUTINES C048 DEFW NUDGE_ALONG_V Facings 0 and 1, not mirrored: NUDGE_ALONG_V, along V; 2 and 3, mirrored: NUDGE_ALONG_U, along U
C04A DEFW NUDGE_ALONG_V
C04C DEFW NUDGE_ALONG_U
C04E DEFW NUDGE_ALONG_U
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