Re #50: Complete core loading of WarFoundry XML files * Start loading of UnitEquipmentItems * Fix XPath queries for equipment items and abilities * Allow UnitEquipmentItem to be created without a UnitType * Make adding UnitEquipmentItem to UnitType set UnitType of UnitEquipmentItem * Make loading of abilities and equipment items add the item to the race Also: * Code cleanup (line endings) * Make method to get equipment by ID return null instead of throwing "no such key" exception