GODT-22: Frontend-backend

- GODT-1246 Implement settings view.
- GODT-1257 GODT-1246: Account and Help view
- GODT-1298: Minimal working build (panics)
- GODT-1298: loading QML (needs Popup window)
- GODT-1298: WARN: Adding PopupWindow not possible!
    In therecipe qt the `quickwidgets` classes are within `quick` module, but
    forgot to add library and include paths into cgo flags. Therefore
    compilation fails and it would be hard to patch therecipe in order to
    fix it.

    I am not sure if rewrite PopupWindow into go would make any difference,
    therefore I decided to use normal QML Window without borders.
- GODT-1298: Rework status window, add backend props, slots and signals.
- GODT-1298: Users
- GODT-1298: Login
- GODT-1298: WIP Help and bug report
- GODT-1178: MacOS dock icon control
- GODT-1298: Help, bug report, update and events
- GODT-1298: Apple Mail config and Settings (without cache on disk)

internal/frontend/qml/HelpView.qml

@@ -0,0 +1,110 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail 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.
+//
+// ProtonMail 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 ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+import QtQuick 2.13
+import QtQuick.Layouts 1.12
+import QtQuick.Controls 2.12
+
+import Proton 4.0
+
+SettingsView {
+    id: root
+
+    Label {
+        colorScheme: root.colorScheme
+        text: qsTr("Help")
+        type: Label.Heading
+        Layout.fillWidth: true
+    }
+
+    SettingsItem {
+        id: setupPage
+        colorScheme: root.colorScheme
+        text: qsTr("Installation and setup")
+        actionText: qsTr("Go to help topics")
+        actionIcon: "./icons/ic-external-link.svg"
+        description: qsTr("Get help setting up your client with our instructions and FAQs.")
+        type: SettingsItem.PrimaryButton
+        onClicked: {Qt.openUrlExternally("https://protonmail.com/bridge/install")}
+    }
+
+    SettingsItem {
+        id: checkUpdates
+        colorScheme: root.colorScheme
+        text: qsTr("Updates")
+        actionText: qsTr("Check now")
+        description: qsTr("Check that you're using the latest version of Bridge. To stay up to date, enable auto-updates in settings.")
+        type: SettingsItem.Button
+        onClicked: {
+            checkUpdates.loading = true
+            root.backend.checkUpdates()
+        }
+
+        Connections {target: root.backend; onCheckUpdatesFinished: checkUpdates.loading = false}
+    }
+
+    SettingsItem {
+        id: logs
+        colorScheme: root.colorScheme
+        text: qsTr("Logs")
+        actionText: qsTr("View logs")
+        description: qsTr("Open and review logs to troubleshoot.")
+        type: SettingsItem.Button
+        onClicked: {Qt.openUrlExternally(root.backend.logsPath)}
+    }
+
+    SettingsItem {
+        id: reportBug
+        colorScheme: root.colorScheme
+        text: qsTr("Report a problem")
+        actionText: qsTr("Report a problem")
+        description: qsTr("Something not working as expected? Let us know.")
+        type: SettingsItem.Button
+        onClicked: {
+            root.backend.updateCurrentMailClient()
+            root.parent.showBugReport()
+        }
+    }
+
+    Label {
+        Layout.alignment: Qt.AlignHCenter
+        colorScheme: root.colorScheme
+        type: Label.Caption
+        color: root.colorScheme.text_weak
+        textFormat: Text.RichText
+        linkColor: root.colorScheme.interaction_norm_active
+
+        text: {
+            var version = root.backend.version
+            var license = qsTr("License")
+            var licensePath = root.backend.licensePath
+            var release= qsTr("Release notes")
+            var releaseNotesLink = root.backend.releaseNotesLink
+            return `<p style="text-align:center;">Proton Mail Bridge v${version}<br>
+            © 2021 Proton Technologies AG<br>
+            <a style="color: ${linkColor};" href="${licensePath}">${license}</a>
+            <a style="color: ${linkColor};" href="${releaseNotesLink}">${release}</a>
+            </p>`
+        }
+
+        onLinkActivated: Qt.openUrlExternally(link)
+    }
+
+    onBack: {
+        root.parent.showAccount()
+    }
+}