Upgrade gradle, support lib, move common versions to root

[jonathan-caryl]

Defining common version numbers in the root project makes it easier to
keep everything in sync when we upgrade things.

[codecov]

Codecov Report

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@@           Coverage Diff           @@
##             develop    #1   +/-   ##
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  Hits               ?     0           
  Misses             ?   516           
  Partials           ?     0

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