Add reference lines and point interface to ploteditor

[JorisGoosen]

https://support.jasp-services.com/SCG-Chemicals/SCG_Chemicals_Public_Company_Limited/issues/16

@vandenman Ill open this as a draft to have it pinned somewhere.

is added to ploteditor, the lowest line is a dummy line where an edit results in a new line.

It sends some extra json in the plotediting as follows:

"editOptions" : 
		{
			"error" : "success",
			"references" : 
			[
				{
					"horizontal" : false,
					"point" : true,
					"text" : "A very  fancy label",
					"x" : 0.0,
					"y" : 0.0
				}
			],
			"resetPlot" : false,
			"xAxis" : 
			{
				etcetera....

[vandenman]

Nice! This is indeed everything I needed to make the R side work:

Code is at https://github.com/jasp-stats/jaspGraphs/tree/referenceLines

Not sure what your workflow is, but you can test this by building jaspDescriptives as a devmodule with renv and then installing jaspGraphs in that renv project with renv::install("path_to_jaspGraphs_checkout") or renv::install("jasp-stats/jaspGraphs@referenceLines").

We can definitely still improve some stuff, but this is already a good start. Perhaps we should have a brief chat to determine what is in scope of this feature and what is not, because it's very easy for me to come up with 100+ tweaks to this (e.g., adding options for label placement, nudging, point color/ shape, etc.).