Begin implementing AndroidX since Java files fail to compile with old AppCompat libraries.

gradle.properties

@@ -15,3 +15,7 @@ org.gradle.jvmargs=-Xmx1536m
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
+
+# Move to AndroidX
+android.useAndroidX=true
+android.enableJetifier=true