Add a touch state for expandable sections in App details

I've linked to the specs for material design. Perhaps we can give the pressed area a ripple effect when tapped, similar to how the serach FAB button responds when pressed.

https://material.io/guidelines/components/buttons.html#buttons-toggle-buttons

changed milestone to %1.1

closed

So this has inadvertantly been done while addressing other things in app details, so closing.

changed milestone to %0.103 - UX Overhaul