Additional column to list mails with a framadate/doodle link

[AntoineTurmel]

The idea is an add-on for Thunderbird to add an additional column (like the enclosed column) to notify user if a mail contains a framadate/doodle link.

To be more complete, the add-on would let the user add customs columns with customized icons based on URL scheme.

Eg. column for framadate
my_icon.png
look for mail containting http://framadate.org/* links.