Update to CM v1.5.0
Update to CM v1.5.2
update to Extended.Wpf.Toolkit.2.0.0
Design Time Properties
Merge https://github.com/petrbalat/CMContrib

Conflicts:
	demos/CMContrib.SL.Demo/CMContrib.SL.Demo.csproj
	src/CMContrib.SL/CMContrib.SL.csproj