refactor: make a plugin for shorthand terms

[tpluscode]

Since we now have the plugin functionality, I thought I would move the code which inserts the shorthand terms kl:DescribeLoader to a plugin. That made me realise too that the logic of loading plugins is unnecessarily tied to the Kopflos class. Instead, I moved that out and now we can initialise the instance with pre-loaded plugin. Good for testing :)

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Latest commit: 0614fb5

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.90%. Comparing base (5437284) to head (0614fb5).

Additional details and impacted files

@@             Coverage Diff             @@
##           plugins     #185      +/-   ##
===========================================
+ Coverage    92.34%   92.90%   +0.56%     
===========================================
  Files           23       25       +2     
  Lines         1032     1043      +11     
  Branches       109      114       +5     
===========================================
+ Hits           953      969      +16     
+ Misses          78       73       -5     
  Partials         1        1              

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[giacomociti]

Although not specifically related to this PR, now I'm noticing the lack of expressivity of the plugin interface: given a Koplos instance, it does something with it. We may examine actual and potential plugins and try to refine this interface