Preinstalled libs

• Adds support for pre-installed libraries
• Adds support for reading from pre-installed config files
• Merges modelsconference and modelsconference.ui into the respective raspberry counterparts
• Some Code-Review

org.fortiss.af3.platform.raspberry/.settings/org.eclipse.core.resources.prefs

 eclipse.preferences.version=1
 encoding//html/external_tools.html=UTF-8
 encoding//model/conti.ecorediag=UTF-8
+encoding//src/org/fortiss/af3/platform/raspberry/modelsconference/AF3PlatformModelsConferenceActivator.java=UTF-8
+encoding//src/org/fortiss/af3/platform/raspberry/modelsconference/ModelsConferencePlatformElementFactory.java=UTF-8
 encoding//uml/exploration.ecorediag=UTF-8
 encoding/<project>=US-ASCII