Draft: Updating Pythia8Production with new generator interfaces
Updating Pythia8Production
class to adapt it to the new generator interfaces as per !151 .
For now, the new interfaces will be put in parallel of the current ones.
A more detailed explanation with diagrams, and on how to test it can be found here https://codimd.web.cern.ch/JtD7xAGqS6S9eSIyfmKqRA#.
Relates to #39