Update interface

[jbreue16]

This is a meta issue to track all the interface changes we want to have for v6

• Make field NPARTYPE mandatory for column UO #589
• Update geometry interface #510
• should the fields ``HAS_FILM_DIFFUSION` etc. become mandatory or remain optional?
• Improve parameter interface #284
• Update Parameter Sensitivity Interface #126
• Improved reactions interface #77
• Unify flowrate / velocity interface #381
• https://github.com/cadet/CADET-Specification/issues/3
• https://github.com/cadet/CADET-Specification/issues/4 -> fixed by Refactor and generalize particle modeling #414
• https://github.com/cadet/CADET-Specification/issues/5
• crystallization: make CRY_MODE mandatory, remove default 1 for primary particle formation
• rename inlet and outlet unit operations to source and sink unit operations (having an outlet and an inlet, respectively)
• Update to consistent axial disc type interface #614