removed a lot of unused (?) ToJSON and FromJSON instances

[nevrome]

Following the discussion in #307 here's a PR that removes a large number of ToJSON and FromJSON instances. Maybe you could finish the job in ServerClient.hs, @stschiff.

If we don't use the instances then I'm all for removing them 🙂!

[stschiff]

OK, great! I have removed the relevant code from ServerClient.hs and also fixed the tests.

[stschiff]

From my point this is good to merge into branch typeMania, where I'll have a final look.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.56%. Comparing base (cc4e4af) to head (52f3e4e).
Report is 5 commits behind head on typeMania.

Additional details and impacted files

@@              Coverage Diff              @@
##           typeMania     #310      +/-   ##
=============================================
+ Coverage      58.09%   59.56%   +1.47%     
=============================================
  Files             29       29              
  Lines           4195     4078     -117     
  Branches         517      484      -33     
=============================================
- Hits            2437     2429       -8     
+ Misses          1241     1165      -76     
+ Partials         517      484      -33     

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