* Expanding CodableHelper with a more customisable dateFormatter and JSON en-/decoder.
* Ran ./bin/swift4-petstore.sh
* Ran ./bin/swift4-petstore-all.sh again after merge from master.
* Ran ./bin/swift4-petstore-all.sh again after building.
* Ran ./bin/swift4-petstore-all.sh again after rebase latest from upstream master.
* sync master, update samples
* Built and ran ./bin/swift4-petstore-all.sh
* Re-adding code which disappeared in rebase from master.
* Fixed test
* [swift] remove old classes
* [AVRO] Fix the package handling for the avro generator (#3987)
Also fix an issue with the outputFolder that wasn't overridable through opts
* Update sample files through avro-petstore.sh
There's an issue with inlined object but it's already present with the previous commit
* Revert the fix on outputFolder (not a bug)
