Make draft logs compatible with MTGO format #5450

[hitch17]

See: #5450

I'm fairly certain that the changes I needed to get access to the set code would break the client/server protocol, so I made a few other refactors at the same time. An alternative approach would be to do a reverse lookup from the set's name to the set's code, but I think this is cleaner as long as the breaking change is acceptable.

[JayDi85]

this is cleaner as long as the breaking change is acceptable.

Yes, it's acceptable. Also changes to Serializable classes interface will break client-server compatibility (see #4459). That's changes must be merged with new versions release like v32.