Improve Treeview Performance

[gtalarico]

http://wwwendt.de/tech/fancytree/demo/

[gtalarico]

• [ ] Add keys to Json
• [ ] Format Json to proper structure
• [ ] Setup standalone Test Page

[gtalarico]

This only seems to be a problem on the large namespace branches (ie DB) where it actually brings the browser to a crawl: http://www.revitapidocs.com/2017/87546ba7-461b-c646-cbb1-2cb8f5bff8b2.htm

Maybe modify treeview to "paginate" (ie only 100) and lazy load others?

[gtalarico]

Implement with new fancytree