flattening of topic channels

src/main/jastadd/flatter/rewrites/ServiceRewrites.jadd

src/main/jastadd/flatter/rewrites/TopicRewrites.jadd

...esden/inf/st/pnml/flatter/template/TemplateConstants.java

...dresden/inf/st/pnml/flatter/transform/ChannelFlatter.java

...esden/inf/st/pnml/flatter/transform/ReferenceFlatter.java

...udresden/inf/st/pnml/flatter/transform/SignalFlatter.java

...f/st/pnml/flatter/transform/ToolspecificsTransformer.java

...en/inf/st/pnml/flatter/transform/TransformationUtils.java

src/main/resources/templates/TopicPublisherTemplate.pnml

...in/resources/templates/TopicSubCallbackQueueTemplate.pnml

src/main/resources/templates/TopicSubDispatcherTemplate.pnml