Make sure that plugins are installed

[knoepfel]

This PR installs:

• generate_layers (driver)
• form_module (output module)
• pymodule
• some C++ header files that were missed in the installation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (76.38%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   76.31%   76.38%   +0.07%     
==========================================
  Files         124      124              
  Lines        2719     2719              
  Branches      469      469              
==========================================
+ Hits         2075     2077       +2     
+ Misses        452      448       -4     
- Partials      192      194       +2     

Flag	Coverage Δ
unittests	76.38% <ø> (+0.07%)	⬆️

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see 5 files with indirect coverage changes

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[knoepfel]

@phlexbot format

[github-actions]

No automatic clang-format fixes were necessary.

[github-actions]

Automatic cmake-format fixes pushed (commit 2beac48).
⚠️ Note: Some issues may require manual review and fixing.