Add DifferenceListViewItem
Implement FilterListView. FilterTimeline and started implementing DifferenceListView
Merge branch 'master' into viewDieZweite

Conflicts:
	CTT/AbstractTimeline.cpp
	ctt/ctt.vcxproj.filters
Add AnalysingOrderingWidget again (was removed with last merge)
Remove FilterListViewElement (old version of FilterListViewItem)
Finish implementation of DifferenceListView
Implement DifferenceTimeline
Include MainController in MainWindow and lots of changes forced by VS
Merge branch 'master' into viewDieZweite
Fix compile errors
Implement DifferenceTimeline
Merge branch 'Natascha' into viewDieZweite

Conflicts:
	CTT/AnalysingOrderingWidget.cpp
	CTT/AnalysingOrderingWidget.h
	CTT/ExtendedVideoAddedOperation.cpp
	CTT/ExtendedVideoAddedOperation.h
	CTT/ExtendedVideoRemovedOperation.cpp
	CTT/FilterListViewElement.cpp
	CTT/FilterListViewElement.h
	ctt/ExtendedTimeline.h
	ctt/ViewState.cpp
	ctt/ctt.vcxproj
Fix build errors
Merge branch 'viewDieZweite' into somewhatBeautyQueen