Make questions more flexible

[megoth]

Today we only allow yes/no-answers to a question. Should expand this to also allow partyA/partyB-answers. I.e. we still only allow binary outcomes, but can change the representations of these options. The colors (and possibly icons) should also be modifiable.

This configuration should be set as part of the overall stack (i.e. question 1 cannot say partyA/partyB while question 2 say partyB/partyA).