Support most/all of the standard library

[naikrovek]

I know that you are aware of the lack of support of the stdlib, I just felt it warranted documentation as an issue.

I have no idea how much time it would take to do this, or what is involved in making this happen, and of course you're free to not do this if you don't want to do it. I see a lot of value in a completely in-browser compiler and runtime.

Thank you for what is done so far, even if it's never expanded to include the standard library!