Update to Gradle 5

[aadilahmed]

Description (required)
Fixes #2824 Update to Gradle 5

What changes did you make and why?
Updated Gradle from version 4.10 to 5.3.1 to
get faster builds and help towards fixing #1941.
Added 'org.apache.commons:commons-lang3:3.8.1'
to fix import errors.

Tested {betaDebug} on Nexus 5X Emulator with API level {24}.

Screenshots showing what changed (optional - for UI changes)

Need help? See https://support.google.com/android/answer/9075928

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Note: Please ensure that you have read CONTRIBUTING.md if this is your first pull request.

[codecov-io]

Codecov Report

Merging #2860 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2860   +/-   ##
======================================
  Coverage    3.74%   3.74%           
======================================
  Files         249     249           
  Lines       12102   12102           
  Branches     1070    1070           
======================================
  Hits          453     453           
  Misses      11615   11615           
  Partials       34      34

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[domdomegg]

Looks good, waiting on #2868 to merge as unsure if this breaks Espresso tests too.

[misaochan]

I am on board with the Gradle update. Not so sure about adding the dependency. Could you please elaborate on what import errors are being experienced, and how the dependency fixes them? Also, should that be in a separate PR from the Gradle update as it addresses a different issue?

[misaochan]

Please see comment above.

[domdomegg]

I am on board with the Gradle update. Not so sure about adding the dependency. Could you please elaborate on what import errors are being experienced, and how the dependency fixes them? Also, should that be in a separate PR from the Gradle update as it addresses a different issue?

I believe it's been added to build.gradle as it should really have been an app dependency, but previously it just worked because either Gradle 4 added it automatically or some other library we use depended on it. As this updates Gradle to Gradle 5, the dependency is no longer automatically included. So really this PR does not add a dependency, it just makes it explicit.

[misaochan]

Ah, thanks for clarifying! In that case I am good with it. Sorry for the slow response, as I have just returned back from the hackathon trip. :)