[Possible breakage]
Removed Perl::Critic::Utils::DataConversion. Any add-on policies that used
it will need to copy the functions from there into their own code.
[Documentation]
ProhibitCascadingIfElse no longer suggests using given/when.
[Internals]
We no longer require Test::Deep for testing.
Test::Kwalitee is now only recommended, not required.
Random microoptimizations, like using hashes for array contents checking,
and using any() instead of calling grep as a boolean.