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

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

@@ -0,0 +1,19 @@
+package carpet.script.exception;
+
+/**
+ * A type of {@link RuntimeException} that doesn't spend time producing and filling a stacktrace
+ */
+abstract class StacklessRuntimeException extends RuntimeException {
+    public StacklessRuntimeException() {
+        super();
+    }
+
+    public StacklessRuntimeException(String message) {
+        super(message);
+    }
+
+    @Override
+    public Throwable fillInStackTrace() {
+        return this;
+    }
+}