Added UI for control center elements.

org.fortiss.af3.platform.raspberry.ui/plugin.xml

...c/org/fortiss/af3/platform/raspberry/ui/editpart/.ratings

...orm/raspberry/ui/editpart/RaspberryPiEditPartFactory.java

...rc/org/fortiss/af3/platform/raspberry/ui/handler/.ratings

...berry/ui/handler/ControlCenterDownstreamInputHandler.java

...pberry/ui/handler/ControlCenterUpstreamOutputHandler.java

...org/fortiss/af3/platform/raspberry/ui/properties/.ratings

...i/properties/RaspberryPiExecutionUnitPropertySection.java

.../org/fortiss/af3/platform/raspberry/ui/prototype/.ratings

...af3/platform/raspberry/ui/prototype/ProtoypeProvider.java

org.fortiss.af3.platform.raspberry/META-INF/MANIFEST.MF

...y/src/org/fortiss/af3/platform/raspberry/compose/.ratings

...af3/platform/raspberry/compose/RaspberryPiCompositor.java