Build sm-dom-form-values.
Remove old sm-tree* build files.

These components were moved into YUI core.
TreeView: Use a throttled render queue to render added nodes.

This ensures that adding a ton of nodes to a parent that's already been
rendered doesn't result in the parent being re-rendered once for each added
child.
TreeView: Ignore clicks and double-clicks from a non-primary mouse button.
Build sm-treeview.