Update this.curCoords in Interaction#pointerHover
Update this.curCoords in Interaction#selectorDown

Should now get the correct action when interacting with a selector
interactable with touch input.
Fix mouse hover problems in IE10
Remove uneccessary condition in getInteractionF...
Remove imposible case from getInteractionFrom...

getInteractionFromEvent is never passed an InteractEvent
Unclaim removed pointers correctly
Modifi getInteraction... to support gesture
Use average coordinates of multiple pointers
Fix errors with element Interactables and gestures
Tidy getXY function
Fix typo: removed second "e" from "gestureable"
Remove redundant average calc for gesture events

In InteractEvent