multiple ports abstraction

...ime/variant/methodcallWithPorts/stage/ObjectProducer.java

...java/teetime/variant/methodcallWithPorts/stage/Relay.java

.../java/teetime/variant/methodcallWithPorts/stage/Sink.java

...riant/methodcallWithPorts/stage/StartTimestampFilter.java

...ariant/methodcallWithPorts/stage/StopTimestampFilter.java

...eetime/variant/methodcallWithPorts/stage/basic/Delay.java

...teetime/variant/methodcallWithPorts/stage/basic/Sink.java

...dcallWithPorts/stage/basic/distributor/CloneStrategy.java

...orts/stage/basic/distributor/CopyByReferenceStrategy.java

...hodcallWithPorts/stage/basic/distributor/Distributor.java

...thPorts/stage/basic/distributor/IDistributorStrategy.java

...WithPorts/stage/basic/distributor/RoundRobinStrategy.java

...ariant/methodcallWithPorts/stage/basic/merger/Merger.java

...dcallWithPorts/stage/basic/merger/RoundRobinStrategy.java

...eetime/variant/methodcallWithPorts/stage/io/DbReader.java

...t/methodcallWithPorts/stage/io/Directory2FilesFilter.java

...nt/methodcallWithPorts/stage/io/File2TextLinesFilter.java

...teetime/variant/methodcallWithPorts/stage/io/Printer.java

...etime/variant/methodcallWithPorts/stage/io/TCPReader.java

...t/methodcallWithPorts/stage/kieker/Dir2RecordsFilter.java