Added property sections for Raspberry Pi units.

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

...i/properties/RaspberryPiExecutionUnitPropertySection.java

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

...ortiss.af3.platform.raspberry/trunk/model/raspberry.ecore

...iss.af3.platform.raspberry/trunk/model/raspberry.genmodel

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

...m/raspberry/annotation/PWMChannelNumberValueProvider.java

...raspberry/generator/executable/PWMActuatorExecutable.java

...platform/raspberry/util/RaspberryModelElementFactory.java