More development.

More types.
Fixed attribute groups in requests.
Started on client.
Saving data to file.

packages/ipp/printerstate_string.go

@@ -9,7 +9,7 @@ func _() {
 	// Re-run the stringer command to generate them again.
 	var x [1]struct{}
 	_ = x[Idle-3]
-	_ = x[Preocessing-4]
+	_ = x[Processing-4]
 	_ = x[Stopped-5]
 }