Improve function signatures

[andgdk]

Description

IDEs appear to be unable to infer the input parameters of functions if they are defined elsewhere.
This limits the design freedom and inhibits exposing optional parameters to keep calling functions reasonably safe.

Investigate how signatures of functions can be improved.

Proposed solution

Research if there is a concept of object destructuring in Scilab.
Review and enhance the function signatures to improve clarity and usability. The current designe of leveraging code-split into .sci files might be ill conceived.

Alternatives considered

Go back to single files or research if IDEs/language services can already handle the use case of providing signatures for imported custom libraries/.sci files or how support can be added.