Fix Play 2.8 artifacts and upgrade library versions, SBT, Scala

Publish Play 2.8 implementation properly

- Create a shared play-json-ops-common-213 for Scala 2.13 implementations
- Create a shared play28-json-ops project for shared Play 2.8 implementations
- Update the build.sbt to cross-compile these projects appropriately and fail loud when versions are unmatched
- Add scala-parallel-collections for Scala 2.13 cross-compatibility