#87 Inventory Item Selection

[Robert Kety]

When selecting an item from inventory, the GUI disappears, but the icon does not remain on the target item.
The appropriate behavior should be: an item is selected from the inventory GUI, the icon becomes the item selected, the user clicks OK, and the icon remains on the item selected.
If the user does not select an item, the icon should return to the same icon that the user had active when they entered the inventory GUI.