Add offline mode support

launcher/minecraft/auth/flows/Offline.h

@@ -0,0 +1,22 @@
+#pragma once
+#include "AuthFlow.h"
+
+class OfflineRefresh : public AuthFlow
+{
+    Q_OBJECT
+public:
+    explicit OfflineRefresh(
+        AccountData *data,
+        QObject *parent = 0
+    );
+};
+
+class OfflineLogin : public AuthFlow
+{
+    Q_OBJECT
+public:
+    explicit OfflineLogin(
+        AccountData *data,
+        QObject *parent = 0
+    );
+};