Log Message:
Update to 52.7.0

Changelog:
    Fixed Searching message bodies of messages in local folders,
          including filter and quick filter operations, did not find
          content in message attachments
    Fixed Better error handling for Yahoo accounts
    Fixed Various security fixes

#CVE-2018-5127: Buffer overflow manipulating SVG animatedPathSegList
#CVE-2018-5129: Out-of-bounds write with malformed IPC messages
#CVE-2018-5144: Integer overflow during Unicode conversion
#CVE-2018-5146: Out of bounds memory write in libvorbis
#CVE-2018-5125: Memory safety bugs fixed in Firefox 59, Firefox ESR 52.7,
                and Thunderbird 52.7
#CVE-2018-5145: Memory safety bugs fixed in Firefox ESR 52.7 and
                Thunderbird 52.7