Bug 535532 - Switch to EPL 2.0

* Changed Java file headers
* Changed license.html in features
* Changed property with license block
* Changed feature xml and plugin xml headers

Change-Id: I2f790bf06ab7e60a1bb3393c6fb7bde82eae5872
diff --git a/features/org.eclipse.graphiti.sdk.feature/feature.xml b/features/org.eclipse.graphiti.sdk.feature/feature.xml
index 81bb66f..c94f465 100644
--- a/features/org.eclipse.graphiti.sdk.feature/feature.xml
+++ b/features/org.eclipse.graphiti.sdk.feature/feature.xml
@@ -1,17 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-<copyright>
-Copyright (c) 2005, 2011 SAP AG.
-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:
-       SAP AG - initial API, implementation and documentation
-       mwenz - Update of Eclipse license
-       mwenz - Use central Eclipse license feature
-</copyright>
+**********************************************************************
+* Copyright (c) 2005, 2019 SAP SE
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* Contributors:
+*    SAP SE - initial API, implementation and documentation
+*    mwenz - Update of Eclipse license
+*    mwenz - Use central Eclipse license feature
+*
+* SPDX-License-Identifier: EPL-2.0
+***********************************************************************
  -->
 <feature
       id="org.eclipse.graphiti.sdk.feature"