Rework of "References" node with real models.
Fix: Doubled members of project types in Class Browser.
Removes namespace attributes from child nodes in the pasted snippet if they are already present in the root where the snippet is pasted.

Added a test "PasteCustomControlUsingMixedTypes" that failed before this fix.
Fixed type resolve when pasting a custom control using StaticResource.
Merge pull request #77 from gumme/WpfDesignerParserFixes

Wpf designer parser fixes
Merge pull request #78 from gumme/WpfDesignerPasteFixes2

Wpf designer paste fixes
Removed problematic double-entry fix for ClassBrowser again.
String can now be added to collections, for example a ResourceDictionary.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/Designer/EditOperationTests.cs
Merge remote-tracking branch 'remotes/origin/WpfDesignerStringResourceFix'

Conflicts:
	src/AddIns/DisplayBindings/WpfDesign/WpfDesign.XamlDom/Project/XamlDocument.cs