@Padanian you did an awesome job adding legend location functionality (#39). Do you think a shadow would be good to have too? We are already drawing a solid frame so it doesn't seem like it would be hard to implement... maybe just a bool to turn it on and off?

Let's make the shadow fall to the lower right so we don't have to go through the trouble of making a shadowLocation object 🙈

If you think it's over the top we can probably let it go. I just thought it might be a nice touch! It would take a few lines here:
https://github.com/swharden/ScottPlot/blob/dba76dd07a61f910c9d034b8b42474068733670a/src/ScottPlot/Renderer.cs#L167-L172

Some examples:
https://www.google.com/search?q=matplotlib+legend+shadow&tbm=isch