Support for touch gestures on web/GestureView by creating a common base component (#1167)

* Moved most of the logic from the native-common/GestureView control into a straight common/GestureView abstract base component, and changed much of the logic away from using raw events as inputs and into the processed RX GestureState types.  Pulled a bunch of the duplicate logic out of web/GestureView and used the new base class.  Added touchstart/move/end support to web/GestureView to now reuse the touch code out of the common GestureView to get web touch support in GestureView!

* Fixing issues on native

* PR feedback

Author: deregtd

src/android/GestureView.tsx

@@ -22,7 +22,7 @@ export class GestureView extends BaseGestureView {
         return _preferredPanRatio;
     }
 
-    protected _getEventTimestamp(e: Types.TouchEvent): number {
+    protected _getEventTimestamp(e: Types.TouchEvent | Types.MouseEvent): number {
         let timestamp = e.timeStamp;
 
         // Work around a bug in some versions of RN where "timestamp" is