Decommission "extras"

[cashaffer]

Based on our email discussions, the following needs to happen to eliminate the "extras" directory.

• sound support should be moved somewhere else within JSAV.
• "stack" support should be moved somewhere else within JSAV (perhaps rename?)
• AVL, redblacktree, and binaryheap support will be moved to a new directory within OpenDSA.

[vkaravir]

My goal was to move things to more suitable places, not to eliminate the extras directory. So I think sound can stay where it is, it is an extension (or an extra) to JSAV.

I also meant for the "stack" support to be moved to the new directory within OpenDSA. What do you think?

[cashaffer]

My goal was to move things to more suitable places, not to eliminate the extras directory.
So I think sound can stay where it is, it is an extension (or an extra) to JSAV.

Does this comment refer to "sound.js"? Where ever you think best.
As for "stack", I don't believe that that belongs in the new DataStructures directory at OpenDSA. It is definitely not a data structure layout extension. It is a control widget, most typically (so far) used to support exercises. To me it makes sense to leave it in JSAV. It is sort of like the slideshow controls widget or the exercise score widget.

[vkaravir]

All the AVs now seem to be using AVL tree, redblacktree, and binaryheap from the OpenDSA repository, so I'll remove them from JSAV repo and close this issue.