feat(active): Removing use of :active in favor of .active for more control of active state

Using the :active pseudo works fine for desktop, but mobile is a
completely different beast, especially with the quirks of each
platform. By intentionally not using any :active selectors and manually
adding/removing a .active class, it gives us a precise control on how
the active state works for ALL platforms. Additionally, this places
less selectors in the css, and reduces the possibility of unnecessary
repaints. Currently this method of using .active instead of :active is
being applied to .button and .item elements.