klm: add parser for en "Ticket for your trip" emails

Thomas Arrowrequested to merge
tarrow/kitinerary:TAKLM3 into master

Add support for english language booking emails from KLM titled "Ticket for your trip" by parsing the table structure and some crude regex work.

n.b. this does not parse similar emails from KLM titled "Booking Confirmed Start <> End"

Tested with 4 sample emails in workbench including single leg, multi-leg single and multi-leg return.

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