Add support for further ftDNA files

[gedankenstuecke]

Quoting a potential user here:

FamilyTreeDNA integration appears only to work for the FamilyTreeDNA Family
Finder test, not for any other testing they performed nor for testing they
did for The Genographic Project.

I have a couple of example files for the additional tests (e.g. Y-chromosomal STRs) that should be supported and be accepted too. I need to anonymize these first. Once that's done I can provide the general format. If someone wants to work on this I'll prioritize it.