Create `Tournament` objects from the tabbycat API

[daankoning]

For similiar reasons to #4.

[daankoning]

I identify 2 main problems here.

Primarily that the API doesn't (as far as I am able to tell, both from prodding around and looking at the documentation) give acces to speaks and results on a per round basis. This alone probably already dooms this idea as the information that it would be able to fetch would be very limited.

Furthermore, even the data that is available varies greatly from tournament to tournament based on the privacy settings. This means that 1) the information available is even further limited and that 2) implementation seems quite painful.

[daankoning]

Scraping seems like a decent workaround but the tabbycat T&C need to be checked first before that.

[daankoning]

Seems to be possible as of TabbycatDebate/tabbycat#2207.