restricted export for outline view to its elements
-new package [..].outlining.util
-moved Group-,Outline-,|RootOutlineTreeNode to [..].outlining.util package
-fixed export section in MANIFEST.MF

Signed-off-by: marcel.dausend <marcel.dausend@uni-ulm.de>
updated version numbers of the engine and the eclipse plugin
-new version dependencies included by pom.xml in parent project

Signed-off-by: marcel.dausend <marcel.dausend@uni-ulm.de>