Improve error handling during flow initialization and flow processing

[Slider0007]

The Feature

• Implement an adapted struture to have a possibility to add further error handling and user feedback during flow initialization and flow processing
  • new states Initialization failed, Flow aborted, ...
  • ...
• Implement additional error handling during flow init and during flow processing
  • Files not available / not readable
  • Paramater input range verification
  • ...
  • In first instance I would prioritize handling of tflite files in init and flow processing states
• Check possibility to redo init without restart? Can be at least forseen as option in new structure

This is a long term topic. In first instance an adapted structure needs to be implemented to have the basics for further implementation of additional error handling