move apis into rom/modules/main for shell compatibility

sys/modules/opus/array.lua

@@ -0,0 +1,13 @@
+local Array = { }
+
+function Array.filter(it, f)
+	local ot = { }
+	for _,v in pairs(it) do
+		if f(v) then
+			table.insert(ot, v)
+		end
+	end
+	return ot
+end
+
+return Array