[TIMOB-4350] Android: Update ImageView with pinch-zoom and double-tap zoom support

*Summary:* Update Ti.UI.ImageView to support pinch-zoom and double-tap zoom support. Remove usage of deprecated Java [ZoomControls](https://developer.android.com/reference/android/widget/ZoomControls) widget and use [ScaleGestureDetector](https://developer.android.com/reference/android/view/ScaleGestureDetector) instead. *To-Do:* Android's Ti.UI.ImageView already has an [enableZoomControls](https://titaniumsdk.com/api/titanium/ui/imageview.html#enablezoomcontrols) property which shows the [ZoomControls](https://developer.android.com/reference/android/widget/ZoomControls) widget showing +/- buttons. Nobody uses this UI widget anymore. We should continue to support the "enableZoomControls" property, but re-purpose it to use the [ScaleGestureDetector](https://developer.android.com/reference/android/view/ScaleGestureDetector) instead. *Parity Issue:* On iOS, pinch-zooming an ImageView is implemented via a ScrollView by setting its [maxZoomScale](https://titaniumsdk.com/api/titanium/ui/scrollview.html#maxzoomscale) to a value greater than 1.0. Unfortunately, this is a parity issue between the 2 platforms. *Example Code:*

const window = Ti.UI.createWindow();
window.add(Ti.UI.createImageView({
	image: "https://raw.githubusercontent.com/appcelerator/titanium_mobile/master/tests/Resources/ExifRotate270.jpg",
	scalingMode: Ti.Media.IMAGE_SCALING_ASPECT_FIT,
	enableZoomControls: true,
	width: Ti.UI.FILL,
	height: Ti.UI.FILL,
}));
window.open();

*Helpdesk Ticket:* http://appc.me/APP-121155 http://appc.me/APP-422217 http://appc.me/APP-768251