TreeViewer Compiliert aber noch nicht fertig
Added ILazyContentProvider

Change-Id: I3df5fc768cd04b8a59ca7c8859003092ea4daeea
Signed-off-by: Hendrik Still <hendrik.still@gammas.de>
Generified TreeViewerRow & TreeViewerColumn

Change-Id: I9e61e448be40a8848db732f642f1cdeb38765f94
Signed-off-by: Hendrik Still <hendrik.still@gammas.de>
Generified ITreeViewerListener

Change-Id: Ife2457e134b160623d5f175112680080c09537e4
Signed-off-by: Hendrik Still <hendrik.still@gammas.de>