Suggestion to the trade system

Hi,

In order to avoid market manipulation and boting I suggest the following change:

An item can only be sold once. If you modify it by crafting it's accounted as a new item that could be sold again, once.

So you can sell white to people who will buy them, upgrade them and resell them.
You can buy a leveling item but you can't resell it, except if you modify it (risking to lose value).

I think this change will remove all ability for bots to manipulate the market or force price. It will also help the market not to be saturated with lower level items, so drops don't loose value versus trade.

It's quite easy to implement as it only add a boolean value to the items stats to be checked before it could be entered into trade and adjusted after it's sold or enchanted.

And also, of course. Instant buying/selling while AFK should be implemented ASAP, regardless of the actual form.