changes:
APCs now have directional sprites for WEST and EAST directions.
Fire Alarms' offsets are now enforced similarly to APCs'.
Fire Alarms now have mapper convenience types for each direction to make mapping them easier.
All fire alarms on the map have been replaced with the above convenience types, fixing some strange offsets in the process.
APCs no longer pre-create their spark effect datum, instead using the spark() proc.
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