Added missing copyright header and GridLayout to StatechartPreferencePage

plugins/org.yakindu.sct.ui.editor/src/org/yakindu/sct/ui/editor/preferences/StatechartPreferenceConstants.java

@@ -1,3 +1,13 @@
+/**
+ * Copyright (c) 2012 committers of YAKINDU and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * Contributors:
+ * 	committers of YAKINDU - initial API and implementation
+ * 
+ */
 package org.yakindu.sct.ui.editor.preferences;
 
 import org.eclipse.gmf.runtime.diagram.ui.preferences.IPreferenceConstants;