Rename ship/station scrap drop entities to "debris"

src/lib/ecs/system/ai/SalvageScrapEvaluator.h

@@ -1,13 +1,13 @@
 #pragma once
 
 class EntityAdmin;
-class ScrapSystem;
+class DebrisSystem;
 
-// When cargo is not full, finds the nearest scrap within sensor range and sets
-// it as the target, scoring high. Scores inactive when cargo is full or no scrap
+// When cargo is not full, finds the nearest debris within sensor range and sets
+// it as the target, scoring high. Scores inactive when cargo is full or no debris
 // is in range (Advance then handles roaming).
 class SalvageScrapEvaluator
 {
 public:
-    void evaluate(EntityAdmin& admin, const ScrapSystem& scraps);
+    void evaluate(EntityAdmin& admin, const DebrisSystem& debris);
 };