Upgrade to Robolectric 4

[domdomegg]

Description (required)

Upgrade to Roboelectric 4. This is so we can upgrade Gradle and various other components so the app is more stable and we can get instrumentation tests working again (#2868).

What changes did you make and why?

• Upgrade to Robolectric 4
• Added missing androidx test dependency
• Removed deprecated code (e.g. some imports, the @Config constants field)
• Added android.enableUnitTestBinaryResources as per the migration guide. This causes a compile time warning but does not cause any actual problems. Upgrading the Android Gradle plugin will remove this warning (see known issues under https://github.com/robolectric/robolectric/releases/tag/robolectric-4.0.2), however I think this is best done when updating Gradle (Update to Gradle 5 #2824) or as a separate PR.

Tests performed (required)

Tested betaDebug on API level 28
All unit tests pass

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[codecov-io]

Codecov Report

Merging #2982 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2982   +/-   ##
======================================
  Coverage    3.69%   3.69%           
======================================
  Files         247     247           
  Lines       12213   12213           
  Branches     1081    1081           
======================================
  Hits          451     451           
  Misses      11728   11728           
  Partials       34      34

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