Introduce HandlerUserSettings to change user settings, e. g. pw changes

handlers/handlerusersettings.h

@@ -0,0 +1,13 @@
+#ifndef HANDLERUSERSETTINGS_H
+#define HANDLERUSERSETTINGS_H
+#include "handler.h"
+class HandlerUserSettings : public Handler
+{
+  public:
+	using Handler::Handler;
+	Response handleRequest(const Request &r);
+	bool canAccess(const Permissions &perms);
+	std::string accessErrorMessage();
+};
+
+#endif // HANDLERUSERSETTINGS_H