[TIMOB-27340] iOS: Support macOS compatibility (project Catalyst)

Okay - this is a tough one. Starting in Xcode 11, Apple allows it's developers to deploy macOS apps from existing iOS apps. In detail, this would allow Titanium apps to be run on macOS as well. More [here](https://developer.apple.com/ipad-apps-for-mac/). Looking at the details, there are only a few blockers right now: - Some methods used from the UserNotifications framework are unavailable on macCatalyst - The (deprecated) AddressBook and AssetsLibrary system frameworks are unavailable - The APSHTTPClient and APSAnalytics would need to be recompiled for compatibility - not too critical since there are no deprecated underlaying API's used internally And really - that's it! Probably some new API's for improved support (such as menu handling using UIMenu or multi-window support using UIScene) as well as some tooling to inject the new build settings like SUPPORTS_MACCATALYST and CODE_SIGN_IDENTITY\[sdk=macosx*\] and it works. A quick PoC is attached :) !Bildschirmfoto 2019-08-17 um 18.25.37.png|thumbnail! !Bildschirmfoto 2019-08-17 um 18.17.13.png|thumbnail!