AST-1091 Use proper definition for python Steps

Maik Nijhuisrequested to merge
ast-1091-simplify-python-step into master
  • Using 'Step' instead of 'StepWrapper' as base class allows using all steps from python.
  • Add std::shared_ptr holder, besides the PyStepImpl trampoline.
  • Remove StepWrapper members since python steps can implement those themselves.
Edited by Maik Nijhuis

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