Make sure all data types use configured compression in t2b/b2t

For 2.0 release (map and orswot currently use compression):
- [x] lwwreg (only ever in map, which never calls to_binary/1 in lwwreg)
- [x] od-flag (only ever in map, which never calls to_binary/1 in od-flag)
- [x] pn-counter (we've kinda looked at this, but compression might do better)

For later:
- [ ] gcounter
- [ ] gset
- [ ] oe-flag
- [ ] orset