Add multiple tabs / question

[tomdantuit]

As an interviewer using CoDE, I'd like to be able to define multiple "files" as part of a single question that show up as tabs the candidate can see. Tabs should have a name that defaults to "Tab #". A nice to have would be able to change the name of each tab.

An example would be given a question regarding MVC, I can have a tab representing the Model file, the View file, and the Controller file.