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Pull Request Prelude
Changes Proposed
Prevent empty names from being added to nameToItems and prevent Items::getItemByName return a valid item id when the name is empty.
Make sure the Items::getItemIdByName behavior is exact: for each item id there will be only one name and the name will be the first found in items.xml.
Changed NameMap from unordered_multimap to unordered_map since multiple keys is useless now and probably before.