Add detection of output files

[nuest]

Similarly to inputfiles detection, we could parse a script and detect the created (data, figure) files.

[MarkusKonk]

This is still interesting. One example is "Technical note: Fourier approach for estimating the thermal attributes of streams" which creates to csv files write.csv(result, "FFT_estimation_result.csv") in line 117 and write.csv(Timeseries.estimated, "Extrapolation_result.csv") in line 227.
It would nice to have these in the files in a separate metadata field, e.g. "outfiles", so we can distinguish these files in the UI.