Rename ship/station scrap drop entities to "debris"

src/lib/sim/Simulation.h

@@ -33,7 +33,7 @@ class MovementIntentSystem;
 class RepairSystem;
 class SalvagerSystem;
 class ShipSystem;
-class ScrapSystem;
+class DebrisSystem;
 class WaveSystem;
 
 class Simulation: public CombinedEventHandler<TracePrintRequestedEvent>
@@ -122,8 +122,8 @@ public:
     const BeltSystem&     getBelts() const;
     ShipSystem&           getShips();
     const ShipSystem&     getShips() const;
-    ScrapSystem&          getScraps();
-    const ScrapSystem&    getScraps() const;
+    DebrisSystem&          getDebrisSystem();
+    const DebrisSystem&    getDebrisSystem() const;
     EntityAdmin&          getAdmin();
     const EntityAdmin&    getAdmin() const;
 
@@ -172,7 +172,7 @@ private:
     // Stores their IDs in m_currentEnemyStationIds.
     void placeEnemyStationSet(int generation);
 
-    // Tick step 9: remove dead ships and buildings, drop scrap, handle push.
+    // Tick step 9: remove dead ships and buildings, drop debris, handle push.
     void tickDeathsAndLoot();
 
     // Generate up to 3 schematic choices (REQ-DEF-SCHEMATIC-DROP) for the player.
@@ -269,7 +269,7 @@ private:
     std::unique_ptr<AiSystem>         m_aiSystem;
     std::unique_ptr<MovementIntentSystem> m_movementIntentSystem;
     std::unique_ptr<DynamicBodySystem>    m_dynamicBodySystem;
-    std::unique_ptr<ScrapSystem>      m_scrapSystem;
+    std::unique_ptr<DebrisSystem>      m_debrisSystem;
     std::unique_ptr<SalvagerSystem>   m_salvagerSystem;
     std::unique_ptr<RepairSystem>     m_repairSystem;
     std::unique_ptr<WaveSystem>       m_waveSystem;