SPIGOT-213: Add method to enable / disable AI for mobs

src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java

@@ -528,4 +528,16 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
     public AttributeInstance getAttribute(Attribute attribute) {
         return getHandle().craftAttributes.getAttribute(attribute);
     }
+
+    @Override
+    public void setAI(boolean ai) {
+        if (this.getHandle() instanceof EntityInsentient) {
+            ((EntityInsentient) this.getHandle()).m(!ai); // PAIL: rename
+        }
+    }
+
+    @Override
+    public boolean hasAI() {
+        return (this.getHandle() instanceof EntityInsentient) ? !((EntityInsentient) this.getHandle()).cR() : false; // PAIL: rename
+    }
 }