GODT-1893: bridge-gui sends bridge's log to stdout, stderr.

WIP: bridge-gui now parses and self-apply log level from command-line.
WIP: downgraded the log level of gRPC calls to debug.

internal/frontend/bridge-gui/bridge-gui/CommandLine.h

@@ -0,0 +1,29 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+
+#ifndef BRIDGE_GUI_COMMAND_LINE_H
+#define BRIDGE_GUI_COMMAND_LINE_H
+
+
+#include <bridgepp/Log/Log.h>
+
+
+void parseCommandLineArguments(int argc, char *argv[], QStringList& args, QString& launcher, bool &outAttach, bridgepp::Log::Level& outLogLevel); ///< Parse the command-line arguments
+
+
+#endif //BRIDGE_GUI_COMMAND_LINE_H