Support dinamically-sized output variables

[gian-didom]

The deployment of a code which involved variable-size outputs did not work because the pointer type appeared among the outputs and no handling was foreseen.

The timeline for the implementation of this feature is the following:

• Enable execution of the code using pointers as outputs; the variable-sized variables are not accessible but the fixed-sizes are and the timing works.
• Implement handling of mxArrays. This involves modification of the callFunction function with an extension that reads the data and size of the variable-sized inputs. These values are returned in the outputs. The deserializer should be able to handle this in the form of a FixedMatrix with a pre-determined maximum size. Check if the pre-determined maximum size can be inferred from the MATLAB Coder .mat artefacts.