Transferring the ListItem attached properties to ListItemStyle API. Most of the style API became redundant, and removed. Few API from ListItem were also removed as not needed. ListItemAnimator, UCListItemAttached and UCActionPanel classes removed.
Panel swiping overshoot made elastic. Snapping animation transformed into SmoothedAnimation, uses velocity of 60GU/second.
Approved by PS Jenkins bot, Tim Peeters.