Editor

@kadst43 @eric79 

Most of this is code that will build an HTML DOM structure to display JSON objects. If you click "Edit" > "Edit Scenarios...", it will display two blank scenarios generated when the application loads (those are just for testing). You will initially see "+ scenarios", just click that to expand it. Arrays and objects are expandable. Right now, you can't edit the actual data. That's the next part I need to hook up.

It's probably more useful to developers than it is teachers or non-technical people, but it's a start.