Migrate to androidX

[maskaravivek]

Description (required)

Fixes #2593

What changes did you make and why?

• migrate to android X

Tests performed (required)

:app:build

[domdomegg]

Tested 2.10.1-debug-androidXMigration~cbd344d99. All seems to work.

Beta Commons upload.

Can you make the changes requested to keep gradle.properties tidy, then happy to merge.

[codecov-io]

Codecov Report

Merging #2594 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #2594      +/-   ##
=========================================
+ Coverage    2.69%   2.69%   +<.01%     
=========================================
  Files         258     258              
  Lines       12319   12318       -1     
  Branches     1117    1117              
=========================================
  Hits          332     332              
+ Misses      11961   11960       -1     
  Partials       26      26

Impacted Files	Coverage Δ
...fr/free/nrw/commons/mwapi/model/MwQueryResult.java	0% <ø> (ø)	⬆️
...n/java/fr/free/nrw/commons/CommonsApplication.java	0% <ø> (ø)	⬆️
...ons/explore/categories/SearchCategoryFragment.java	0% <ø> (ø)	⬆️
...va/fr/free/nrw/commons/campaigns/CampaignView.java	0% <ø> (ø)	⬆️
...ks/locations/BookmarkLocationsContentProvider.java	0% <ø> (ø)	⬆️
.../java/fr/free/nrw/commons/di/NetworkingModule.java	0% <ø> (ø)	⬆️
...c/main/java/fr/free/nrw/commons/utils/UiUtils.java	0% <ø> (ø)	⬆️
...n/java/fr/free/nrw/commons/MediaDataExtractor.java	0% <ø> (ø)	⬆️
...free/nrw/commons/theme/NavigationBaseActivity.java	0% <ø> (ø)	⬆️
...fr/free/nrw/commons/settings/SettingsActivity.java	0% <ø> (ø)	⬆️
... and 114 more

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[maskaravivek]

@domdomegg Thanks for reviewing and testing this PR. I made the requested changes :)

[domdomegg]

Tested 2.10.1-debug-androidXMigration~6467db5ef on API level 28, 25, 19.

Tested 2.10.1-debug-androidXMigration~6467db5ef on API level 28

Beta Commons 28
Beta Commons 25
Beta Commons 19

[maskaravivek]

@domdomegg Can the PR be merged? I have other changes that I would like to do once this is merged to master. :)