Java 11 migrate remaining (g,h,i) (#1116)

* Moves game-loop to Java 11

* Moves guarded-suspension to Java 11

* Moves half-sync-half-async to Java 11

* Moves hexagonal to Java 11

* Moves intercepting-filter to Java 11

* Moves interpreter to Java 11

* Moves iterator to Java 11

half-sync-half-async/src/test/java/com/iluwatar/halfsynchalfasync/AppTest.java

@@ -25,12 +25,8 @@ package com.iluwatar.halfsynchalfasync;
 
 import org.junit.jupiter.api.Test;
 
-import java.util.concurrent.ExecutionException;
-
 /**
- * 
  * Application test
- *
  */
 public class AppTest {