fix server-client interaction broken since 1.1.8.4

[nevrome]

v1.1.8.4 (#221) broke the communication between old (before 1.1.8.4) versions of poseidon-http-server and new versions of trident. This was foreseeable, yet unforeseen

This PR is meant to fix this incompatibility by reverting some of the JSON encoding/decoding related changes. This is not entirely trivial, because we do need a working JSON scheme for CsvNamedRecord (which did not exist in the past). To make sure that everything works, we need to consider the following cases:

• [x] 1. Old server + New client
• [x] 2. New server + Old client
• [x] 3. New server + New client

I ran some quick tests on the command line with a local server, and old and new client versions.

# v1.1.8.5 client + old (?) server
trident list --remote --packages | --groups | --individuals  -j Nr_SNPs

#  v1.1.8.5 client +  v1.1.8.5 server
poseidon-http-server -d 2010_RasmussenNature -c -z testDir
trident list --remote --remoteURL "http://127.0.0.1:3000" --packages | --groups | --individuals -j Nr_SNPs

#  v1.1.7.0 client + v1.1.8.5 server
wget https://github.com/poseidon-framework/poseidon-hs/releases/latest/download/trident-Linux
chmod +x trident-Linux
./trident-Linux list --remote --remoteURL "http://127.0.0.1:3000" --packages | --groups | --individuals -j Nr_SNPs

Works for all combinations.

[codecov-commenter]

Codecov Report

Base: 68.59% // Head: 71.80% // Increases project coverage by +3.21% :tada:

Coverage data is based on head (8404f18) compared to base (500b9e6). Patch coverage: 64.28% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #228 +/- ## ========================================== + Coverage 68.59% 71.80% +3.21% ========================================== Files 18 18 Lines 2283 2270 -13 Branches 258 246 -12 ========================================== + Hits 1566 1630 +64 + Misses 459 394 -65 + Partials 258 246 -12 ``` | [Impacted Files](https://codecov.io/gh/poseidon-framework/poseidon-hs/pull/228?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=poseidon-framework) | Coverage Δ | | |---|---|---| | [src/Poseidon/Janno.hs](https://codecov.io/gh/poseidon-framework/poseidon-hs/pull/228?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=poseidon-framework#diff-c3JjL1Bvc2VpZG9uL0phbm5vLmhz) | `83.12% <64.28%> (+3.09%)` | :arrow_up: | | [src/Poseidon/CLI/List.hs](https://codecov.io/gh/poseidon-framework/poseidon-hs/pull/228?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=poseidon-framework#diff-c3JjL1Bvc2VpZG9uL0NMSS9MaXN0Lmhz) | `87.90% <0.00%> (+45.96%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=poseidon-framework). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=poseidon-framework)

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[nevrome]

OK - I'm merging this now. Further testing of this very change will happen in #226. I'm taking the full responsibility!