Bug and aesthetic fixes

EditSceneWindow
- Unlock items were being displayed in the dropped item area and vice
versa.  Reversed the fields.

- Changed the name of "Cancel" on EditSceneWindow to "Discard", now only
visible when adding a new Scene.

EditItemWindow
- Made it so the name of the item is the selected text when opening the
window

AddItemWindow
- Switched how the messages were being displayed in the drop down box to
match how they are displayed in the EditSceneWindow.

Tyrone