Improve the current WS Tester

Improving the current WebService Tester view, mayb splitting the current tester that supports both SOAP and REST styles into 2 separate viewers (with maybe a common code base).

Some ideas:

• removing some unnecessary options in the SOAP Tester (ex: HTTP Methods),
• adding embedded XML and JSON Editors to edit the request / response entities,
• generate request entity skeletons from the expected java class