Post shutdown fixes

src/main/java/com/volmit/iris/util/plugin/IrisService.java

@@ -18,10 +18,16 @@
 
 package com.volmit.iris.util.plugin;
 
+import com.volmit.iris.Iris;
 import org.bukkit.event.Listener;
 
 public interface IrisService extends Listener {
     void onEnable();
 
     void onDisable();
+
+    default void postShutdown(Runnable r)
+    {
+        Iris.instance.postShutdown(r);
+    }
 }