Android Studio is warning a call (from Firebase) will be deprecated end of 2019. This updates the versions of * Frebase * Gradle from 4.10.1 to 5.1.1 Also stubs a missing keyboard event handler in some of the sample/test projects.
* Update compile/target SDK version from 27 to 28 * Migrate appcompat namespace (See https://developer.android.com/jetpack/androidx/migrate)
* Fix KeyboardHarness to compile * Add keycode app for debugging `keyCode` and `scanCode` output from physical keyboards (app doesn't use KMEA)