* feat: Pass NS app native controller to the native app instead of presenting it over the rootViewController
When NativeScript embedded app is created from the native one we check for whether the topmost UIViewController has NativeScriptEmbedder protocol (implemented in the iOS Runtime) method 'presentNativeScriptApp:'. If yes, we call it with the NS app viewcontroller as a parameter so the embedder has control over the NS app (where and how to present it etc.) For backwards compatibility we present the NS app on top of the topmost UIViewController as a fallback.
* style: Fix lint errors
* feat: Check for protocol instead of selector in embedding
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* Check for rootController instead of topViewController to prevent crash if !rootController
* feat: Introduce NativeScriptEmbedder singleton
NativeScriptEmbedder is responsive for communication between the NS and the native iOS app. His delegate will implement methods which we can call from javascript such as "presentNativeScriptApp:".
* Fix typings for nativeValueChange
* Update properties.d.ts
Changed parameter name of nativeValueChange from “target” to “owner”
Fixed white space to match coding style
* Update properties.d.ts
Fixed white space
* fix: crash at application launch on Android P
Reference: https://developer.android.com/preview/restrictions-non-sdk-interfaces
Android P introduces new restrictions on the use of non-SDK interfaces, whether directly, via reflection, or via JNI. These restrictions are applied whenever an app references a non-SDK interface or attempts to obtain its handle using reflection or JNI.
In particular, remove reflection via Class.getDeclaredField() and fallback default transition to fade transition.
* refactor: create default transition based on SDK version
Create default transition and setup default animations based on SDK version.
This is to avoid reflection via Class.getDeclaredMethod() for Android P where it throws.
* refactor: extract isAndroidP method
* feat(view): introduce LayoutChanged event
* test(view): add LayoutChanged event tests
* chore(view-android): attach to onLayoutChange only if listener attached
* feat(view-android): override on/off in order to attach and detach from OnLayoutChangeListener
* feat(tabview): add tab text font size property
* chore(tabview): set tab font size default value
* chore(tabview): move font implementation to widget
* chore(tabview): fix font size get return type
* feat(ios): Added support for css gradients.
* feat(android): Added support for css gradients.
* fix: Fixed gradient borders on ios
* fix(gradient): added backgroundGradient to View and Style.
* fix(ios-gradients): fixed ios gradients covering view content.
* test(gradient): Added ui app tests for background gradients.
* test(gradient): Added a test ensuring background gradient property is applied to style.
* style(gradient): Fixed tslint errors.
* fix(gradient): Removed the background-gradient property and added the gradient to background-image.
* style: fixed a consecutive blank line tslint error.
* fix(tests): fixed the bug that was causing tests to fail.
* chore(linear-gradient): fix equality comparer
* test(gradient): add linear gradients test app
* chore(tslint): update with latest tslint rules
