* add TouchEvent on android
* add GestureHandler to detect touches on android
* add property to enable touchDetector on android
* add onTouch event to ios
* add GestureRecognizer to ios
* add onTouch property and js setup
* add missing semicolons
* fix literal notation
* add missing ":"
* fix copy-paste error (wrong var-name)
* pass the native event to the onTouch callback
* replace : with ;
* add onTouch type defs
* add documentation for onTouch property
* scale postion before emitting since the event coordinates are raw pixels
* migrate advanced example to native pinch zoom and onTouch
* split onTouch property into onTap and onDoubleTap
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