Add label to lathe UI (and friends) to show when no materials are loaded (#12893)

Also, don't list materials which have previously been loaded and
completely consumed.

Co-authored-by: Eoin Mcloughlin <helloworld@eoinrul.es>

Resources/Locale/en-US/lathe/ui/lathe-menu.ftl

@@ -6,3 +6,4 @@ lathe-menu-search-designs = Search designs
 lathe-menu-search-filter = Filter
 lathe-menu-amount = Amount:
 lathe-menu-material-display = {$material} {$amount} cm³
+lathe-menu-no-materials-message = No materials loaded