Add XamlDragAndDrop sample showing dragging between ListViews#1015

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michael-hawker wants to merge 4 commits intomicrosoft:mainfrom michael-hawker:mhawker/dragdrop-position2

Commits on Nov 9, 2018

Add additional XamlDragAndDrop sample to show how to preserve user position when dragging to ListView.
michael-hawker
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Commits on Nov 10, 2018

Fix implementation to use visuals to determine location for better results.
michael-hawker
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Commits on Nov 12, 2018