Rewrite wrench. INCOMPATIBLE WITH OLD ITEMS

You must place all of your picked up nodes before
updating and pick them back up after.

wrench/support.lua

@@ -0,0 +1,71 @@
+--[[
+supported_nodes
+This table stores all nodes that are compatible with the wrench mod.
+Syntax:
+	[<node name>] = {
+		lists = {"<inventory list name>"},
+		metas = {["<meta name>"] = STRING,
+			["<meta name>"] = INT,
+			["<meta name>"] = FLOAT},
+		owned = true,
+		store_meta_always = true,
+	}
+	owned - nodes that are protected by owner requirements (Ex. locked chests)
+	store_meta_always - when nodes are broken this ensures metadata and 
+	inventory is always stored (Ex. active state for machines)
+--]]
+
+wrench.META_TYPE_INT = 0
+wrench.META_TYPE_FLOAT = 1
+wrench.META_TYPE_STRING = 2
+
+local INT, STRING, FLOAT  = 
+	wrench.META_TYPE_INT,
+	wrench.META_TYPE_STRING,
+	wrench.META_TYPE_FLOAT
+
+wrench.registered_nodes = {
+	["default:chest"] = {
+		lists = {"main"},
+	},
+	["default:chest_locked"] = {
+		lists = {"main"},
+		metas = {owner = STRING,
+			infotext = STRING},
+		owned = true,
+	},
+	["default:furnace"] = {
+		lists = {"fuel", "src", "dst"},
+		metas = {infotext = STRING,
+			fuel_totaltime = FLOAT,
+			fuel_time = FLOAT,
+			src_totaltime = FLOAT,
+			src_time = FLOAT},
+	},
+	["default:furnace_active"] = {
+		lists = {"fuel", "src", "dst"},
+		metas = {infotext = STRING,
+			fuel_totaltime = FLOAT,
+			fuel_time = FLOAT,
+			src_totaltime = FLOAT,
+			src_time = FLOAT},
+		store_meta_always = true,
+	},
+	["default:sign_wall"] = {
+		metas = {infotext = STRING,
+			text = STRING},
+	},
+}
+
+function wrench:original_name(name)
+	for key, value in pairs(self.registered_nodes) do
+		if name == value.name then
+			return key
+		end
+	end
+end
+
+function wrench:register_node(name, def)
+	self.registered_nodes[name] = def
+end
+