Minor fixes to make it work again (TESTED)

 * Just missed a few things...
Putting a few more things into the right namespace.

 * Move some functions into a new 'Util' namespace.
 * Move some functionality out of the handler and
   into the Seller namespace.
Add ability to destroy zero gold items.

 * Huge warnings, a delay, and other stuff.
   By default it will give you 30 seconds to unmark
   the item as junk.