~ clean-up, further development
~ added ' public static IBundleMakerArtifact getReferencedArtifact(IBundleMakerArtifact artifact, String fullyQualifiedName)'
+ introduced 'IResourceArtifactContent' for future refactorings
~ moved several parts from 'org.bundlemaker.core.ui' to 'org.bundlemaker.core.ui.artifact'
~ cleaned up launchers
~ fixed NPE
+ added 'IMovableUnit'
+ added 'AbstractDependencySelectionAwareEditorPart'
~ made editor selection aware