Predefine entities VERSION, RELEASEYEAR, RELEASEDATE

[fingolfin]

Resolves #115

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.87%. Comparing base (31aff21) to head (b726131).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   81.84%   81.87%   +0.02%     
==========================================
  Files          13       13              
  Lines        2181     2190       +9     
==========================================
+ Hits         1785     1793       +8     
- Misses        396      397       +1     

Files with missing lines	Coverage Δ
gap/Magic.gd	100.00% <ø> (ø)
gap/Magic.gi	73.35% <100.00%> (+0.62%)	⬆️

... and 1 file with indirect coverage changes

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