Recover changes to build PyPI package

[lochel]

This recoveres some changes to create a PyPI package for OMSimulator, but I'm uncertain about the current state of the changes. I would appreciate insights from @mahge on the best approach before proceeding further.

To generate the PyPI package, follow these steps:

1. Build the project using the OM_OMS_ENABLE_PIP option in CMake:

   cmake -S . -B build/ -DCMAKE_INSTALL_PREFIX=install/ -DOM_OMS_ENABLE_PIP=ON
   cmake --build build/ --target install
   

2. Run the Makefile:

   make pip
   

3. Upload the package using twine:

   twine upload src/pip/install/dist/OMSimulator-2.1.1.post248.tar.gz