V2.0.1 libanki update

Hi Norbert,

Would you please have time to review these changes please?
They are all libanki updates that I could identify that we were missing since September (although I think we were only missing some in December). The relevant anki commit hash is included in my commit message for each one of them.
That should bring us up-to-date with anki 2.0.4

Thank you