Photosurface example: flickable surface

The Flickable provides a way of testing interaction with 2-finger
trackpad gestures: if the cursor is over the background, you can flick
the surface via wheel events (which come from native flick gestures
if you are using a trackpad on OS X); inside the bounds of a photo,
the same 2-finger gesture is for zooming and rotating.

Also, random position and rotation are applied more correctly,
and only at startup.  Position and rotation changes are animated.

Change-Id: Iab49b7f2e99a9686424368fd94f0b7f89807da22
Reviewed-by: Morten Johan Sørvig <[email protected]>

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