Increase number of inputs/outputs jsonifier / add other types

[wvangeit]

At the moment the number of inputs / outputs of jsonifier (and as such a study) is limited to 12. This should be increased, but we need to make sure the computational backend can handle it.

[wvangeit]

As discussed in the MM meeting. Suggestion: if input ports are more complex, we don't need all these many ports, put parameters could go into single ports