[INTERNAL] Moved preferenceutil to nebula and renamed it to EclipsePreferenceUtil
[FEATURE] New OSGIPreferenceUtil
[FEATURE] Possiblity to save and restore the expanded items of a viewer
[FIX]  PaintUtils no longer soils the pre-configured colours
[DEVEL] FilterableTreeViewer
Merge branch 'develop' of https://github.com/bkahlert/com.bkahlert.devel.nebula into develop