trade <item> to <target>
trade <item1>,<item2>,<item3> to <target>
Description: This command offers an item (or items) and/or coin to another player who can
then offer items and/or coin in return.
The person who has been offered a trade can view their inventory from within
the trade prompts using "i" or "i <modifier>" as if they were using the
inventory command normally.
