[Xcode11] Launch images are deprecated in iOS 13.0

[DimitarTachev]

Environment

• CLI: 6.0.3
• Cross-platform modules: 6.0.1
• iOS Runtime: 6.0.1

Describe the bug
Building a HelloWorld JS app using Xcode 11 beta 5 is showing the following warning:
jsHelloWorld/platforms/ios/jsHelloWorld/Resources/Assets.xcassets:./LaunchImage.launchimage: warning: Launch images are deprecated in iOS 13.0. Use a launch storyboard or XIB instead.

To Reproduce

1. npm i nativescript@latest
2. sudo xcode-select -s <path-to-your-xcode11-beta5>
3. tns create jsHelloWorld --js && cd jsHelloWorld
4. tns build ios --emulator

Expected behavior
The app should be built without any warnings.

Acceptance criteria

• The warning should be present with live templates and missing with rc templates

Related to: #4909

[KristianDD]

The solution to remove the warnings is:

1. In ../App_Resources/iOS/build.xcconfig the configuration ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage; should be removed.
2. ../App_Resources/iOS/Assets.xcassets/LaunchImage.launchimage should be deleted