* Update testing dependencies
* Add testing dependencies to WorkManager sample
* Add CleanupWorkerTest
* Add Test for BaseFilterWorker
* Test periodic execution

This reverts commit 61d7b0c5

Rely on the `buildToolsVersion` that is bundled with the version of Android Gradle Plugin.

Test: ./run_all_tests.sh

Allow for incrementally updating the `compileSdkVersion` before upgrading the `targetSdkVersion`. In this case, they are both API 29 so this is a no-op.

Test: ./run_all_tests.sh

Make it more clear that each artifact group is independent from one another.

Test: ./run_all_tests.sh

Upgrade to the latest releases:

- Navigation 2.2.0-alpha01
- AppCompat 1.1.0-rc01
- Fragment 1.2.0-alpha02
- Lifecycle 2.2.0-alpha03

As Navigation and the -ktx modules are built with Java 8 bytecode, many of the projects now also use Java 8.

Any times we were using a FrameLayout as a container for fragments, it has been switched to the new FragmentContainerView.

This change also involves replacing the deprecated ViewModelProviders.of() with either `by viewModels()` or the `ViewModelProvider` constructor and removing all dependencies on lifecycle-extensions, which only contains deprecated classes at this point.

Also took the opportunity to remove support.v4 from all projects as it was not being used anywhere.

Test: ./run_all_tests.sh

* Add the explicit dependency on lifecycle extensions.
* Add `kotlinJvmOptions` as the `ktx` library targets Java 8.

Change-Id: Icc46cd2a80b2fb9e716a8b2abf7b70961f4d70d6

Additionally bump androidx.arch.core to 2.0.1 and add it as a dependency in WorkManagerSample and NavigationAdvanceSample to avoid conflicting versions between app and test variant.

Change-Id: I4ccc1fa4acffcecbc954b32cf36455f7454bb273

* Move to RenderScript library provided by the framework.
* Fix proguard-rules.pro to enable obfuscation.

Change-Id: If85bf0a008a8a706a4f362d24817faad3c3144f5

Besides refactoring a lot of imports, this PR also makes the following changes:

* Updated to targetSDK 28 and build tools 28.0.3 along with android
  gradle plugin 3.2.0
* Updated various compile and and androidTestCompile to their
  implementation version.
* Bumped Kotlin version and moved from the jre to the jdk version of
  the stb libs.
* Bumped Dagger to 2.16 which contains a fix for projects using the
  androidx namespace.
* Bumped Glide to 4.8.0 which also contains a fix for projects using
  the androidx namespace.
* Removed dexmaker in favor of mockito-android in some of the sample
  projects that used it.
* Added android.useAndroidX=true and android.enableJetifier=true to
  various gradle.properties in projects that used data binding and/or
  used libraries that expected the old namespace.

* Bitmap comparisons are only being made for custom scripts.
 ScriptIntrinsic outputs vary by platform version.

Change-Id: I64ff5a02cf8b57b2be7d5517c7f91303eacc698c

* These tests show how to use `work-testing`.

Change-Id: I4a91be4f6b7121c5cb6772a7f0b34eefb4a0efe1

Update GithubBrowserDemo to use navigation.

Change-Id: Iaa864e2f6eaaf006d5437c1be7c65318c3f29559