Python wrapper: update CMakeLists, and rename the module to 'pyiec61850'

[mbourhis]

• update the CMakeLists

  • remove the deprecated commands ('PythonInterp', ...) (https://cmake.org/cmake/help/latest/module/FindPythonInterp.html)

  • change the CMake minimum version from 3.8 to 3.12 (released in July 2018)

• rename the libiec61850 Python module into 'pyiec61850'

  • to avoid name conflict with the name for the C static lib
  • the build artifacts are now 'pyiec61850.py' and '_pyiec61850.so'

[mbourhis]

Close the PullRequest: wrong destination branch

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

4 Bugs
0 Vulnerabilities
13 Security Hotspots
216 Code Smells

No Coverage information
16.6% Duplication

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