* Added getAdditionalSelectors function so that nativescript-theme can be functional again in NS 4.x
* Change to a better more extensible additional css system.
* removed redunant function on the name.
* Fix lint issues
* Adding mergeSelectors to the remove function
* Added test of new add/remove css functions.
* fix: revert testRunner.ts changes that disabled all tests except style
* refactor: fix typo
* chore: fix typo and change test to no not affect global styles
Adding android typings for API levels from 17 to 27
BREAKING CHANGES:
There is no longer added `I` prefix in the names of the interfaces. For example `android.view.IMenuItem` is now `android.view.MenuItem`. This matches the original name of the interface in the android framework.
* 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(list-view): Adds the ability to check whether or not an Item at index is Visible on screen within a listView
* feat(list-view): add the unit-test for checking if list-item is visible.
* clean(list-view): fix invalid reference in list-view-common
* chore(list-view): remove unused logic
* test(list-view) updates the tests for checking if item at index is visible
* chore(ListView Tests): update the test_check_if_item_at_index_is_visible unit test to include 40 children, and test if the last item is visible or not.
* Chore(ListView IOS): Apply requested changes to the for-loop, and replace with Array.some for readability.
* chore(ListView android): Fix TSLint issues.
Rework the frame api to support working with multiple Frames.
* frameModule.topmost() - now returns the last navigated Frame or
the currently selected tab item's Frame if the tab item's view is a
Frame.
* frameModule.getFrameById(id: string) - returns a navigated Frame by id.
* args.object.page.frame - can be used in page elements event handlers.
Returns the Frame of the current element's page.
* chore: Update madge-android npm script path
* fix(animations): change throw -> trace to avoid unnecessary app crash
Fixes major cause of crashes/bugs in production apps using animation.
* Fix fix animation throw (#1)
* chore(tests): Cleanup code snippets comments
* refactor(animations): Plat-specific cancel and play methods refactored
