Rework dibs into hivemind

Imperfect, will require tweaking.

core/src/mindustry/entities/units/Hivemind.java

@@ -0,0 +1,27 @@
+package mindustry.entities.units;
+
+import arc.*;
+import arc.util.*;
+import arc.struct.*;
+import mindustry.entities.*;
+import mindustry.entities.type.base.*;
+
+import static mindustry.Vars.unitGroup;
+
+public class Hivemind{
+    private static long lastFrameUpdated = -1;
+    private static Interval timer = new Interval(1);
+
+    public static void update(){
+        if(Core.graphics.getFrameId() == lastFrameUpdated) return;
+        lastFrameUpdated = Core.graphics.getFrameId();
+        if(!timer.get(30)) return;
+
+        ObjectSet<CraterUnit> craters = new ObjectSet<>();
+        unitGroup.all().each(e -> e instanceof CraterUnit, crater -> craters.add((CraterUnit)crater));
+
+        craters.each(crater -> {
+            crater.purpose = Units.anyEntities(crater.aspires()) ? crater.on() : crater.aspires();
+        });
+    }
+}