intermediate release

Changelog:

• fix bugs in virtual source
• fixed potential bugs in c-code (mostly kModule)
• fixed buffer overflow and added canaries to important structs
• add initial cythonized virtual-source (pru-code) (thanks @WiresharkIO)
• improved logging-performance and cleaned up code
• fixed doc-builder

maintenance:

• primary branch is now "main"
• added code of conduct
• ansible-scripts: linter, reformat, cleanup, restructure
• add pre-commit and github-actions, for
  • building documentation
  • test and build python-packages
  • linter, format most source-code
  • spellcheck