2-add-keyword-support (#6)

More development.

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

More types. Printing from chromeos works a little bit.

More types.

Spelling corrections.

WIP: Fix keyword handling

Move request to a separate file and add test.

Co-authored-by: Henrik Sölver <henrik.solver@gmail.com>
Reviewed-on: #6
Co-Authored-By: henrik <henrik.solver@gmail.com>
Co-Committed-By: henrik <henrik.solver@gmail.com>

packages/ipp/printerstate_string.go

@@ -0,0 +1,26 @@
+// Code generated by "stringer -type printerState ."; DO NOT EDIT.
+
+package ipp
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[Idle-3]
+	_ = x[Processing-4]
+	_ = x[Stopped-5]
+}
+
+const _printerState_name = "IdlePreocessingStopped"
+
+var _printerState_index = [...]uint8{0, 4, 15, 22}
+
+func (i printerState) String() string {
+	i -= 3
+	if i < 0 || i >= printerState(len(_printerState_index)-1) {
+		return "printerState(" + strconv.FormatInt(int64(i+3), 10) + ")"
+	}
+	return _printerState_name[_printerState_index[i]:_printerState_index[i+1]]
+}