GUI: Added support for defining named icons to the theme

Now we can define icon names for each equipment box and then look up the
icon image through the theme, enabling some shared control over
equipment slot icons between the game data and GUI theme.

The icon for an equipment slot is also no longer rendered when the slot
has an item in it.

Removed the needless storing of equipment box positions and images in
the EquipmentWindow, because this information is readily available from
the InventoryHandler and the images are already loaded by the Theme.

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