Merge remote-tracking branch 'origin/feature/osgviewerQt' into slohia

Conflicts:
	include/mainwindow.h
	src/mainwindow.cpp
Merge remote-tracking branch 'origin/feature/osgviewerQt' into slohia

Conflicts:
	include/mainwindow.h
	qtWidgets/src/tree_view.cpp
	src/mainwindow.cpp
Merge remote-tracking branch 'origin/feature/tabs' into slohia

Conflicts:
	include/mainwindow.h
	qtWidgets/ui/inspector.ui
	qtWidgets/ui/visualizer.ui
	src/mainwindow.cpp
Update inspector tab with doubleslider usign custom widget
Add simulation stuff from feature/simulation branch
Update inspector tab
Merge branch 'feature/tabs', remote-tracking branch 'origin' into feature/osgviewerQt
TreeWidget completed
Merge remote-tracking branch 'origin/feature/osgviewerQt' into slohia

Conflicts:
	include/mainwindow.h
	osgDart/src/DartNode.cpp
	qtWidgets/ui/inspector.ui
	qtWidgets/ui/visualizer.ui
	src/mainwindow.cpp
Merge new treeview stuff