Migrate BPEL

The BPEL standard changed a lot from WBISF5.1 in BTT version 5.1 to WPS6 in BTT version 5.2. BTT BPEL extension programming model changed from strong type to shared mode. You need to create new BPEL and copy the logic. Yet the code may still be compatible and the BTT super classes such as BaseSnippet is still available for you to extend. To avoid logical problems, you need to reconsider the definition file such as BPEL file and logic.s