Pyproject migration

[JCGoran]

Pyproject migration.

TODO list:

• move docs building to a separate script instead ofsetup.py
• replace all CLI flags with env variables (more or less done)
• use cython CLI command to build RX3D and MUSIC Python modules instead of in setup.py (we can then use CMake for them)
• add script to change name of project (since we can't use native utils for this)
• figure out how to pass extra_compile_args and extra_link_args
• fix various paths in generated wheel (see install_manifest.txt)
• fix versioning
• fix NMODL complaining about NMODL_PYLIB not being set (only in the MacOS CI though?)
• add project.scripts section to pyproject (so we have nrniv, nrnivmodl, etc. scripts)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.36%. Comparing base (d3d8886) to head (0727293).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2832      +/-   ##
==========================================
+ Coverage   67.14%   68.36%   +1.21%     
==========================================
  Files         562      493      -69     
  Lines      104087    93440   -10647     
==========================================
- Hits        69890    63877    -6013     
+ Misses      34197    29563    -4634     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarcloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[bbpbuildbot]

Logfiles from GitLab pipeline #204928 (: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