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/qml/Notifications/Notification.qml

@@ -0,0 +1,54 @@
+// 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/>.
+
+import QtQml 2.12
+import QtQuick.Controls 2.12
+
+QtObject {
+    id: root
+
+    default property var children
+
+    enum NotificationType {
+        Info = 0,
+        Success = 1,
+        Warning = 2,
+        Danger = 3
+    }
+
+    // title is used in dialogs only
+    property string title
+    // description is used in banners and in dialogs as description
+    property string description
+    // brief is used in status view only
+    property string brief
+
+    property string icon
+    property list<Action> action
+    property int type
+    property int group
+
+    property bool dismissed: false
+    property bool active: false
+    readonly property var occurred: active ? new Date() : undefined
+
+    property var data
+
+    onActiveChanged: {
+        dismissed = false
+    }
+}