Update to AndroidX

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This is mostly the work of Android Studio's
   Refactor > Migrate to AndroidX...
option. That mostly worked. The two places which were manually updated
were:
  - The reference to AppBarLayout$ScrollingViewBehavior in
    loyalty_card_edit_activity.xml
  - The suggested constraintlayout version, 2.0.0-beta4 caused build
    issues that 1.1.3 avoids

...

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