Use _gesture prop of selector Interactables

Assign selectorGesture to it
Make testing PointerEvents easier
Add getTouchPair() to get first 2 touches of thing
Use getTouchPair in touch property functions
Modify tests for IE10+ PointerEvents
Add recorderd PointerEvents to debug return object
Use case insensitive regex for MS prefixed events

MSPointer{Down,Move,Up}