Replace the deprecated ListBox with the ItemListbox

Registered by Erik Ogenvik

CEGUI has two kinds of listboxes; the old ListBox and the new ItemListBox. The former has been deprecated, but is still present. The newer one allows for any kind of widget to be placed in a list, in contrast to the former which didn't allow for any customization of the appearance of the list items.
This job entails making sure that our implementation of the ItemListBox looks ok, then updating ListHolder to be able to provide filtering for ItemListBoxes as well as ListBoxes. Once that's done, switch over all instances of ListBox to ItemListBox.
Once that's done, we can start looking at how to better present lists of materials with nice previews and so on.

Blueprint information

Status:
Not started
Approver:
Erik Ogenvik
Priority:
Medium
Drafter:
Erik Ogenvik
Direction:
Needs approval
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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