NOISSUE Various changes from multiauth that are unrelated to it

logic/FileSystem.h

@@ -0,0 +1,13 @@
+// Licensed under the Apache-2.0 license. See README.md for details.
+
+#pragma once
+
+#include "Exception.h"
+
+namespace FS
+{
+DECLARE_EXCEPTION(FileSystem);
+
+void write(const QString &filename, const QByteArray &data);
+QByteArray read(const QString &filename);
+}