Impl serde::{Serialize, Deserialize} for crate defined symbol types

[Robbepop]

Closes #45.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.60%. Comparing base (a0bcae3) to head (aa820ef).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
+ Coverage   60.44%   60.60%   +0.15%     
==========================================
  Files          11       11              
  Lines         498      500       +2     
==========================================
+ Hits          301      303       +2     
  Misses        197      197              

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