Allow android multi touch actions without an element

The multi action spec does all of its actions on elements. But there is no real reason for doing it that way. Both the Android and iOS methods work on absolute coordinates, so the element is essentially ignored.

This adds elementless access to multi-actions in Android. iOS works as is.

The second commit adds a decoding of `press`-`wait`-`moveTo`-`release` action sequence into a `swipe`. Without this it is not possible to reliably use `duration` of swipe actions.