Implemented possibility for controls to catch all key events on DesignPanel and to suppress default keydown action if needed
A fix for first in first out to placementoperation commit
Format changes.
Merge remote-tracking branch 'remotes/origin/WpfDesignerKeyHandlerAndOverride'

Conflicts:
	src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/DesignPanel.cs