[TIMOB-20241] Windows: Implement Ti.UI.View.convertPointToView( point, destinationView )

convertPointToView( point, destinationView ) : Point Translates a point from this view's coordinate system to another view's coordinate system. Returns null if either view is not in the view hierarchy. Keep in mind that views may be removed from the view hierarchy if their window is blurred or if the view is offscreen (such as in some situations with Titanium.UI.ScrollableView). If this view is a Titanium.UI.ScrollView, the view's x and y offsets are subtracted from the return value. http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.View-method-convertPointToView - https://github.com/appcelerator/titanium_mobile/blob/707baf65702530b957513651af4987a9f6a0fd56/android/titanium/src/java/org/appcelerator/titanium/proxy/TiViewProxy.java#L1149 - https://github.com/appcelerator/titanium_mobile/blob/bc85170157d3bebc5de1d61a9fe6e34bce84a8c9/mobileweb/titanium/Ti/_/UI/Element.js#L274 - https://github.com/appcelerator/titanium_mobile/blob/8e5f028f5995389cb31a35b217ebf033d230fc65/iphone/Classes/TiViewProxy.m#L667 https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.uielement.transformtovisual.aspx