Align SPDX header for Python files

[erikbosch]

This is to make sure all our Python files fulfill our current SPDX check

This PR do:

• Adds SPDX to all python files that did not had it before
• Add our generic copyright to those files (without SPDX) that did not had it before. In some cases this means that explicit Bosch copyright is removed
• Adds python3 shebang for all executables.
• Also making all "top level" python files executable.