Added CSV reader for Lua

to deal with biomes.csv and decorations.csv
(not implemented yet)

csv.lua

@@ -0,0 +1,12 @@
+local function read_csv(path)
+	local file = io.open(path, "r")
+	local t = {}
+	for line in file:lines() do
+		if line:sub(1,1) ~= "#" and line:find("[^%,% ]") then
+			table.insert(t, line:split(",", true))
+		end
+	end
+	return t
+end
+
+return read_csv