Remove all the container node stuff from AphrontTagView

Summary: See discussion in D6131, D6130. This turned into 35 layers of mess so throw it away and just tweak the JS to be more flexible.

Test Plan:

• Clicked "Show More Applications".
• Clicked "Show Fewer Applications".
• Edited tasks using popup dialog.
• Tried to drag tasks using pencil icon (correctly no longer works).
• Changed threads in Conpherence.
• Not sure how to actually hit the Conpherence "Load ... Threads" thing since it seems to auto-load? But that works, at least, and the code doesn't really care what you hit.
• Added a conpherence participant.
• Added a new calendar item.
• Poked around other menus.

Reviewers: chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6133