Implement PointerEvents for Pen and Tablet input

[yohanboniface]

Originally reported by: Anonymous

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The main use case would be to handle pen usage better. A pen can increase speed and accuracy of input.

Ideally:

free hand polygon/polyline draw tool.

pan lock button (right now the pen by default does a click-drag)

Spec:
http://www.w3.org/TR/pointerevents/

Code sample:
http://blogs.msdn.com/b/davrous/archive/2013/02/20/handling-touch-in-your-html5-apps-thanks-to-the-pointer-events-of-ie10-and-windows-8.aspx

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• Bitbucket: https://bitbucket.org/yohanboniface/umap/issue/64

[yohanboniface]

Original comment by Yohan Boniface (BitBucket: yohanboniface, GitHub: yohanboniface):

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This has to first land in Leaflet.draw, see Leaflet/Leaflet.draw#2
I may work on this, but no idea when I can have time enough.

[yohanboniface]

Should work since we use Leaflet.Editable.