Add extractors for Kintetsu Railway Limited Express reservations

Summary:
The format is free-form text, so regular expressions are necessary.
Everything but the train name/number (which is not in the email sent by
their system) is extracted.

Test Plan: Manually fed an email in kitinerary-workbench, got data extracted.

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: kde-pim

Tags: KDE PIM

Differential Revision: https://phabricator.kde.org/D26257