This is not complete, be it versions or the protos itself.

Should be enough for whatever we're realistically doing, though.

Field names and such may change between versions, I don't care enough to standarize it.

And for those who don't know yet, version X.5 equals (X+1).0

E.g. version 4.0.51 means the protobuf can be used for version 4.1.0