feature: Support refactoring: e.g., changing input parameters of a flow => Change it also in dependant flows

[wasnertobias]

When refactoring anything in a flow that is being used as a sub-flow another flow, it is a lot of manual refactoring work to do. It is easy to miss things. And it is just annoying not to be able to simply change the name of input parameters. Every dependant flow has to be opened, and then the input parameters are emptied out => Have to be set again.

I would really appreciate a feature that would make refactoring more convenient!