Drag and drop actions

[Galad]

Add actions that allows to drag elements on a page:

var itemToDrag = Target.The("item to drag").LocatedBy(By.Id("item"));
var drop = Target.The("Drop target").LocatedBy(By.Id("drop"));
var action = Drag.Target(itemToDrag).AndDropTo(drop);
Actor.Given(action);

• [ ] Drag target and drop to other target: Drag.Target(itemToDrag).To(drop)
• [ ] Drag target and drop to other target by moving the cursor by steps: Drag.Target(itemToDrag).ToByMovingCursor(target)
• [ ] Drag target, move x pixels and drop: Drag.Target(itemToDrag).ToByOffset(100, 50)