pip install compatible for python modules

[SengerM]

• Python modules are installed using the preferred pip install method.
• Dependencies are automatically installed by pip.
• It is possible to install the Python modules within a virtual environment created with python -m venv venv_name (enforced by default in Ubuntu 24.04).
• Remove the following three deprecation warnings:
  1. DEPRECATION: Loading egg at /home/crazyscientist/.local/lib/python3.12/site-packages/CSXCAD-0.6.2-py3.12-linux-x86_64.egg is deprecated. pip 24.3 will enforce this behaviour change. A possible replacement is to use pip for package installation.. Discussion can be found at https://github.com/pypa/pip/issues/12330,
  2. DEPRECATION: Loading egg at /home/crazyscientist/.local/lib/python3.12/site-packages/openEMS-0.0.36-py3.12-linux-x86_64.egg is deprecated. pip 24.3 will enforce this behaviour change. A possible replacement is to use pip for package installation.. Discussion can be found at https://github.com/pypa/pip/issues/12330,
  3. DEPRECATION: Loading egg at /home/crazyscientist/.local/lib/python3.12/site-packages/numpy-2.1.2-py3.12-linux-x86_64.egg is deprecated. pip 24.3 will enforce this behaviour change. A possible replacement is to use pip for package installation.. Discussion can be found at https://github.com/pypa/pip/issues/12330.
• In case of error, installation script fails with meaningful error message and without printing "have fun using openEMS".
• Makes possible pip -e installation for development in the Python modules.

Tested in Fedora 40, Python 3.12.2. I expect it will work out of the box in any modern Linux system. The pip install method should also work in any other modern system supported by Python, like Apple or Windows.

This PR is connected with:

• CSXCAD - Pip installation #45
• openEMS - Pip installation #151

[SengerM]

Seems to have helped someone, see here in #241 .