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   Update to thunderbird 52.5.0/lightning 5.4.5.

   See https://www.mozilla.org/en-US/thunderbird/52.3.0/releasenotes/,
   https://www.mozilla.org/en-US/thunderbird/52.4.0/releasenotes/
   and https://www.mozilla.org/en-US/thunderbird/52.5.0/releasenotes/

   Fixes https://www.mozilla.org/en-US/security/advisories/mfsa2017-20/,
   https://www.mozilla.org/en-US/security/advisories/mfsa2017-23/
   & https://www.mozilla.org/en-US/security/advisories/mfsa2017-26/ (pending)

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