Small refactoring changes

[RobinTF]

1. Removed several unused includes and global using declarations in header files.
2. Unify several includes to not use relative but global paths.
3. Turn several macro constants into proper constexpr variables.
4. As we only ever use the short version of the git hash, we now only store this short version. That makes the code simpler, as we don't have to manually shorten the hash before printing it. This also works with older indices, but those will report the full hash.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ea905cc) 87.46% compared to head (a9acd9e) 87.45%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1257      +/-   ##
==========================================
- Coverage   87.46%   87.45%   -0.02%     
==========================================
  Files         307      304       -3     
  Lines       27771    27744      -27     
  Branches     3116     3115       -1     
==========================================
- Hits        24291    24263      -28     
+ Misses       2346     2344       -2     
- Partials     1134     1137       +3     

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[joka921]

Some small suggestions.

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud