Implement currency, shops, and enhanced NPC interaction system

world/town/objects/chisel.toml

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+name = "Chisel"
+description = "A sharp steel chisel, used for fine woodwork or stone carving."
+kind = "tool"
+takeable = true
+value_gold = 0
+value_silver = 3
+value_copper = 50

world/town/objects/small_hammer.toml

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+name = "Small Hammer"
+description = "A sturdy iron hammer with a wooden handle, suitable for small repairs or light construction."
+kind = "tool"
+takeable = true
+value_gold = 0
+value_silver = 5
+value_copper = 0