Add the ability to pick up items left in rooms (also items left after a defeat)

[andye456]

Items are scattered randomly in rooms that do not contain other characters (it is assumed that any items that are in a room are picked up by that character). The player can pick up the items and add them to their inventory up to a limit in weight. After a fight the player can pick up the items that the opponent was carrying, subject to their own weight limits.

[andye456]

Implemented, weight limits not implemented yet.