Added BaseTeamUpgrade and ArmoryUpgrade type and icon
Add all weapon tier shop items including dependency on Armory upgrade for some
Add Library attributes to all necessary shop items
Add InventoryContainer.Replace and InventoryItem.Replace to replace any item in a slot with another item
Add Equipment Inventory to list of inventories to search for Player.FindItems
Add Team Upgrades NPC and populate both that and Item Store NPC with appropriate classes