Group headers in once for class registration

[alkino]

• Move classreg.h to classreg.hpp
• Create ctor_f and dtor_f
• Stop installing unused hoc_membf.h
• Move hoc_membf into classreg.hpp

[azure-pipelines]

✔️ ce1a4b3 -> Azure artifacts URL

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.08%. Comparing base (885617d) to head (e698b43).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3247   +/-   ##
=======================================
  Coverage   67.08%   67.08%           
=======================================
  Files         569      569           
  Lines      111079   111079           
=======================================
  Hits        74520    74520           
  Misses      36559    36559           

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[azure-pipelines]

✔️ e698b43 -> Azure artifacts URL

[bbpbuildbot]

Logfiles from GitLab pipeline #239248 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp