new command line options

• improved command line help message
• new "xmlpkg" option to add non-standard xml package to generated code

flexible SOAP support for loose coupling to concrete client implementation

• generate structs not only from schema but also for wsdl messages that have multiple parts and are to be executed RPC style.
• remove the very simple soap client implementation from generated code so that the client can be more easily dependency-injected into more complex soap client implementations
• renovated internals removing all deprecated code
• updated/adapt unit test to new behaviour