Support for unit missiles

core/src/mindustry/ai/types/MissileAI.java

@@ -0,0 +1,34 @@
+package mindustry.ai.types;
+
+import mindustry.entities.units.*;
+
+public class MissileAI extends AIController{
+
+    //TODO UNPREDICTABLE TARGETING
+    @Override
+    public void updateMovement(){
+        unloadPayloads();
+
+        if(target != null){
+            unit.lookAt(target);
+
+            var build = unit.buildOn();
+
+            //kill instantly on building contact
+            //TODO kill on target unit contact too
+            if(build != null && build == target){
+                unit.kill();
+            }
+        }
+
+        //move forward forever
+        unit.moveAt(vec.trns(unit.rotation, unit.speed()));
+
+    }
+
+    @Override
+    public boolean retarget(){
+        //more frequent retarget. TODO lag?
+        return timer.get(timerTarget, 10f);
+    }
+}