Update to androidx, jdk8, including databinding errors using AS 3.4C8+

[RoarGronmo]

Please update to androidx, jdk8 and check if databinding is correct, importing to AS 3.4C8+ causes following errors:

• What went wrong: A problem occurred configuring project ':app'.

Could not resolve all files for configuration ':app:kapt'. Could not find com.android.databinding:compiler:3.4.0-alpha08. Searched in the following locations: - https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.4.0-alpha08/compiler-3.4.0-alpha08.pom - https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.4.0-alpha08/compiler-3.4.0-alpha08.jar - https://jcenter.bintray.com/com/android/databinding/compiler/3.4.0-alpha08/compiler-3.4.0-alpha08.pom - https://jcenter.bintray.com/com/android/databinding/compiler/3.4.0-alpha08/compiler-3.4.0-alpha08.jar Required by: project :app

RG