fix(ecs-gestalt): Migrate Components to gestalt's Components. (#18)

Ref: MovingBlocks/Terasology#4753

src/main/java/org/terasology/fences/ConnectsToFencesComponent.java

@@ -1,21 +1,8 @@
-/*
- * Copyright 2014 MovingBlocks
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2021 The Terasology Foundation
+// SPDX-License-Identifier: Apache-2.0
 package org.terasology.fences;
 
-import org.terasology.engine.entitySystem.Component;
+import org.terasology.gestalt.entitysystem.component.EmptyComponent;
 
-public class ConnectsToFencesComponent implements Component {
+public class ConnectsToFencesComponent extends EmptyComponent<ConnectsToFencesComponent> {
 }