[decode] Do format detection on Decode, not init.
!WIP openstep
!WIP un/quoted string support, don't use Fprintf.
(actually use openstep encoding for bools)
!WIP brainded openstep plist parser
!WIP parse data, format dates properly, parse strings properly, chug whitespace properly.
!WIP switch on c instead of on true (just because).
!WIP we care more about ReadByte than Peek now. update type names to match.
!WIP update for new parser interface
!WIP add text decoder into Decode()'s format detection