Allow Markdown in annotations

[seven]

I annotate every single tool, every single time. I treat a workflow like documentation. It would be helpful to use markdown in the annotations.

[cgoodman]

In the annotations or in comment boxes would be cool. Here's a more blue-sky idea I've posted about making the canvas a notebook - https://community.alteryx.com/t5/Alteryx-Designer-Ideas/Canvas-as-a-notebook/idi-p/847031