server: re-add capella types

[MariusVanDerWijden]

This PR re-adds the capella types, it also changes the structure a tiny bit to make adding new (and old) forks easier in the future

It should also serve as an example of how easy new forks can be added now

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 57.57576% with 42 lines in your changes missing coverage. Please review.

Project coverage is 43.15%. Comparing base (74a8ecb) to head (cf4bf5b).
Report is 37 commits behind head on develop.

Files with missing lines	Patch %	Lines
server/mock/mock_relay.go	0.00%	22 Missing ⚠️
server/functionality.go	65.11%	11 Missing and 4 partials ⚠️
server/utils.go	40.00%	2 Missing and 1 partial ⚠️
server/service.go	93.10%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #724      +/-   ##
===========================================
- Coverage    43.84%   43.15%   -0.69%     
===========================================
  Files           15       16       +1     
  Lines         1608     1673      +65     
===========================================
+ Hits           705      722      +17     
- Misses         847      900      +53     
+ Partials        56       51       -5     

Flag	Coverage Δ
unittests	43.15% <57.57%> (-0.69%)	⬇️

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