Inspector- help links

[tzachshabtay]

Would be cool to have help links for properties in the inspector which will show the code comments.

For that we need:

1. API project to generate xml comments.
2. HTML rendering from Support HTML rendering #87
3. We can then add markdown rendering- https://github.com/lunet-io/markdig, as that project converts markdown to html
4. Parse the comments from the xml, associate with the correct property and render the markdown when clicking the help link on the property.