[touch-action] Disable zooming when user double tap on element when touch-action=none is enforced

[seb-pereira]

When pointer events are mapped to touch events, a double tap action on elements with touch-action=none cause the viewport to zoom/unzoom. This behavior should be prevented to match the current behavior on IE11 with native pointer events.

[seb-pereira]

This behavior matches the "manipulation" value (see #13).
touch-action=none should disable zooming.