Better use of QProperties
Fix problem when there is no current node
Setting the nodes params
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop

Conflicts:
	buttleofx/MainWindow.qml
	buttleofx/gui/paramEditor/qml/ParamEditor.qml
	buttleofx/gui/paramEditor/qml/ParamString.qml
	buttleofx/gui/viewer/qml/Player.qml
	buttleofx/gui/viewer/qml/Viewer.qml