New models for the serviceengine.xml file. They are not used yet - the ServiceConfigUtil class needs to be updated to use them, as well as other code that uses ServiceConfigUtil. The new models were contributed by Christoph Neuroth and were refactored by me.

https://issues.apache.org/jira/browse/OFBIZ-5204




git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1488643 13f79535-47bb-0310-9956-ffa450edef68