GODT-1667: bridge-gui spawns bridge process. [skip-ci]

Other: renaming of bridge-gui.
WIP: locate bridge exe.
WIP: bridge process launch.
WIP: cleaner closure of bridge.
WIP: grpcClient connection retries.
WIP: clean exit when bridge process is killed.

Fixed issues from MR review. [skip-ci].

WIP: Fixed gRPC case in CMakelists.txt [skip-ci]

It caused issues on Debian.

WIP: update gRPC/protobuf and tweaked CMakeLists.txt. [skip-ci]

WIP: Fixed a bug where splash screen could not be dismissed. [skip-ci]

internal/frontend/bridge-gui/DockIcon/DockIcon.mm

@@ -0,0 +1,49 @@
+// 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/>.
+
+
+#include "Pch.h"
+#include <Cocoa/Cocoa.h>
+#include "DockIcon.h"
+
+
+#ifdef Q_OS_MACOS
+
+
+void setDockIconVisibleState(bool visible) {
+    if (visible) {
+        [NSApp setActivationPolicy: NSApplicationActivationPolicyRegular];
+        return;
+    } else {
+        [NSApp setActivationPolicy: NSApplicationActivationPolicyAccessory];
+        return;
+    }
+}
+
+
+bool getDockIconVisibleState() {
+    switch ([NSApp activationPolicy]) {
+    case NSApplicationActivationPolicyAccessory:
+    case NSApplicationActivationPolicyProhibited:
+        return false;
+    case NSApplicationActivationPolicyRegular:
+        return true;
+    }
+}
+
+
+#endif // #ifdef Q_OS_MACOS