Automate the jpg creation of online plotter results

[ahobeost]

As a User, it would be nice to have the online plotter results before post-processing.
Especially, since the timeStep files are too large to save for parametric runs.

Additional thoughts:

• overlap of data often makes it impossible to see anything
• data groupings may make sense, though plotting individual results and saving them automatically may be easier to implement
• a snapshot of the results at the moment that the system crashes would be very valuable (one online plotter should at least be visible).
• as trnsys can call python directly, it might make sense to create a new online plotter instead.