Replace SoapEndpointRouter's with individual handlers per soapaction

[MLenterman]

Before, this was not possible due to technical limitations in FF. Each soapAction should get it's own handler that has a WebserviceListener specifically listening to the soapAction it handles.

SoapActionHandler should be responsible for: wrapping/unwrapping SOAP, element to move for dealing with large base64 payloads, Building StUF error response or StUF success response, input validation.

Should call the translate handlers that are currently being called from the SoapEndpointRouters. Those handlers should return either nothing or the requested object(s). These should be directly copied into the StUF response message along with stuurgegevens, etc.