Merge with upstream

Merge with upstream

Removed platform declarations from dependencies and updated to version ^5.3.0

Platform declarations are now added as devDependecies.
The update to 5.3.0 version improve the stability of advanced-webview in iOS.
Now crashed after about 150 seconds. The issue needs to be further investigated.
Package created with tns 5.3.2.

Merging with upstream

Merged with upstream repository.
Now directory structure is compliant with the standard for nativescript plugins.
Removed deprecated call to iOS deprecated API

3.1.0 - removed deprecated method for iOS

Updated nativescript platforms to 5.2.0.
Use of ASWebAuthenticationSession method for iOS instead of deprecated SFAuthenticationSession method.

update for iOS 11/12

Added a method for login with iOS 11 and 12, using the new object that allows to share safari datas with the application

2.0.3-phoops: The web view is returned by openAdvancedUrl method

Different objects are returned in Android and iOS.
Using the original object we can close the web view in iOS without
waiting that the user taps on Done button. This is especially useful if
the web view is used for OAuth authentication.