Impact of Pointer Events limitation

[seb-pereira]

This is a placeholder to track and discuss about limitation of the Pointer Events specification when it comes to implement cross platform (browser/device) requirements such as:

1. allow user to hold and drag a list item when the list enforces native scroll (with touch-action giving control to the browser).
   See PR Expose touchTracker as a protected variable of pointerEvents. #25 and issue:
2. pull down 2 refresh feature (also with native scroll)
   See Investigate impact of cross browser/devices Pull down 2 refresh #26

The objective is eventually to decide if and how dpointer should answer to those limitations: should it be breaking the compatibility with the specification, recommend not to use DPointer in certain cases, or implement dedicated solutions depending on the platform.