Make scarpet internal and control flow exceptions stackless (#1392)

src/main/java/carpet/script/exception/ExitStatement.java

@@ -3,7 +3,7 @@ package carpet.script.exception;
 import carpet.script.value.Value;
 
 /* Exception thrown to terminate execution mid expression (aka return statement) */
-public class ExitStatement extends RuntimeException
+public class ExitStatement extends StacklessRuntimeException
 {
     public final Value retval;
     public ExitStatement(Value value)