Preparing stable release 3.0.0

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Preparation for Stable Release 3.0.0

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[codecov]

Codecov Report

Merging #368 (a5fccb7) into master (a19c100) will decrease coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 98.38%.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
- Coverage   97.51%   97.50%   -0.01%     
==========================================
  Files          55       55              
  Lines        9174     9236      +62     
==========================================
+ Hits         8946     9006      +60     
- Misses        228      230       +2     

Flag	Coverage Δ
unittests	97.50% <98.38%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
include/CXXGraph/Utility/Typedef.hpp	100.00% <ø> (ø)
include/CXXGraph/Graph/Graph.hpp	95.67% <98.38%> (+0.09%)	⬆️

... and 1 file with indirect coverage changes