Jeff Young d81e9e6cd1 Code cleanup.
A placement-area is a rule-area sub-type.  We don't
need to say rule-area-placement each time.

Also removes some dead code, and simplifies some
damage-propagation logic.
2025-06-07 17:44:00 +01:00
..
2025-06-07 17:44:00 +01:00