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/ConfigurationItem.qml

@@ -0,0 +1,89 @@
+// 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 QtQuick 2.13
+import QtQuick.Layouts 1.12
+import QtQuick.Controls 2.12
+import QtQuick.Controls.impl 2.12
+
+import Proton 4.0
+
+Item {
+    id: root
+    Layout.fillWidth: true
+
+    property var colorScheme
+    property string label
+    property string value
+
+    implicitHeight: children[0].implicitHeight
+    implicitWidth: children[0].implicitWidth
+
+    ColumnLayout {
+        width: root.width
+
+        RowLayout {
+            Layout.fillWidth: true
+
+            ColumnLayout {
+                Label {
+                    colorScheme: root.colorScheme
+                    text: root.label
+                    type: Label.Body
+                }
+                TextEdit {
+                    id: valueText
+                    text: root.value
+                    color: root.colorScheme.text_weak
+                    readOnly: true
+                    selectByMouse: true
+                    selectByKeyboard: true
+                    selectionColor: root.colorScheme.text_weak
+                }
+            }
+
+            Item {
+                Layout.fillWidth: true
+            }
+
+            ColorImage {
+                source: "icons/ic-copy.svg"
+                color: root.colorScheme.text_norm
+                height: root.colorScheme.body_font_size
+                sourceSize.height: root.colorScheme.body_font_size
+
+                MouseArea {
+                    anchors.fill: parent
+                    onClicked : {
+                        valueText.select(0, valueText.length)
+                        valueText.copy()
+                        valueText.deselect()
+                    }
+                    onPressed: parent.scale = 0.90
+                    onReleased: parent.scale = 1
+                }
+
+            }
+        }
+
+        Rectangle {
+            Layout.fillWidth: true
+            height: 1
+            color: root.colorScheme.border_norm
+        }
+    }
+}