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Make snapshots usable again

* Make the Runner manage the snapshot state. Thread an accessor to the
`t.snapshot()` assertion.

* Save snapshots when runner has finished. Fixes #1218.

* Use jest-snapshot directly, without serializing values. Use jest-diff
to generate the diff if the snapshot doesn't match. This does mean the
output is not colored and has other subtle differences with how other
assertions format values, but that's OK for now. Fixes #1220, #1254.

* Pin jest-snapshot and jest-diff versions. This isn't ideal but we're
using private APIs and making other assumptions, so I'm not comfortable
with using a loose SemVer range.

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