Fix #137 BindingExpression in VS2013 theme

Feature Added: Auto resizing floating window to content thanx to Erik Ovegård

Feature Added: Virtualizing Tabbed Documents and/or LayoutAnchorables PR #143 + Virtualization Options thanx to matko238

• See DockingManager.IsVirtualizingAnchorable, DockingManager.IsVirtualizingDocument, and IsVirtualizing property on LayoutAnchorablePaneControl and LayoutDocumentPaneControl.

Fixed Issue #149 Flicker/Lag when restoring floating window from Maximized state thanx to skyneps

Fixed Issue #150 Restoring floating window position on multiple monitors uses wrong Point for Virtual Screen location thanx to charles-roberts