Framework: Tablet detection 'false' positives

[johnHackworth]

Right now, we are using https://github.com/Automattic/wp-calypso/tree/master/client/lib/touch-detect in several places around the codebase to check if the user is using a table, and change the behaviour of some features to reflect that.

The problem comes when you try to use calypso with a laptop with a touch screen. Since it has all the touch-related events, we are assuming that it's a tablet. We should have a better way of detecting when a device is touch-only or it's a mixed one, since there are plenty of laptops on the market that already sport a touch screen.

[johnHackworth]

Duplicated: #1479