Simple enemy rebuilding AI + fleeing

core/src/mindustry/world/Block.java

@@ -210,6 +210,8 @@ public class Block extends UnlockableContent implements Senseable{
     public boolean hasColor = false;
     /** Whether units target this block. */
     public boolean targetable = true;
+    /** If true, this block attacks and is considered a turret in the indexer. Building must implement Ranged. */
+    public boolean attacks = false;
     /** If true, this block is mending-related and can be suppressed with special units/missiles. */
     public boolean suppressable = false;
     /** Whether the overdrive core has any effect on this block. */

core/src/mindustry/world/blocks/defense/turrets/BaseTurret.java

@@ -32,6 +32,7 @@ public class BaseTurret extends Block{
         update = true;
         solid = true;
         outlineIcon = true;
+        attacks = true;
         priority = TargetPriority.turret;
         group = BlockGroup.turrets;
         flags = EnumSet.of(BlockFlag.turret);