WIP: fix scaling in plot settings

Currently when the scaling of an item is set in the Plot Settings menu, the new scale is not automatically loaded, because it only refreshes the graph.

Even when triggering a reload of the graph however, the scale items in the view menu are not automatically set to the correct scaling either. This is where I needed to dig a bit into the documentation, as I couldn't immediately find out how to programmatically set a new value for these items.

However, I was also considering removing these scalings from the plot settings all together, as these scalings are also directly available in the menu itself, which you need to click anyway to get to that scaling. Opinions on that (or suggestions how to set the scaling in the view menu programmatically) are welcome of course.