Remove plot creator auto-detection completely
While well-intended, it was already realised in #100 (closed) that this feature adds unnecessary implementation complexity with very little benefit:
- The desired creator is often known anyway so its no harm in specifying it.
- Not specifying it and adding all the selection logic makes a configuration much less explicit.
- Especially with the
scope
feature of #301 (closed) in mind and plot functions becoming more and more general there are little distinguishing criteria between plot creators anyway, so attempting to auto-detect on the very few remaining arguments makes little sense.
So: Let's remove it now, even if it breaks things (we do anyway with %Version 0.18).