Update modernizr

[oliverfoster]

Subject of the issue/enhancement/features

Modernizr needs updating as the our version is 2.8.3 and the current stable is 3.5.0

Problems

Modernizr.load API has been retired and so needs replacing in the scriptLoader.js
Modernizr.touch identification API has changed slightly and needs to be made backwards compatible.

Needed Outcomes

Retrofit Modernizr.touchevents to Modernizr.touch + classes
Replace Modernizr.load with loadScript functionality in scriptLoader.js
Implement Adapt.loadScript API with callback as a replacement to Modernizr.load
Remove Modernizr checks which are for <IE11 browsers
Switch to using no-touchevents and touchevents in core
Switch core to use Adapt.device.touch rather than Modernizr.touch