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/MainWindow.qml

@@ -62,7 +62,7 @@ ApplicationWindow {
                 return
             }
 
-            root.showSetup(user)
+            root.showSetup(user,user.addresses[0])
         }
 
         onRowsAboutToBeRemoved: {
@@ -78,15 +78,6 @@ ApplicationWindow {
         }
     }
 
-    function showSetup(user) {
-        setupGuide.user = user
-        if (setupGuide.user) {
-            contentLayout._showSetup = true
-        } else {
-            contentLayout._showSetup = false
-        }
-    }
-
     StackLayout {
         id: contentLayout
 
@@ -111,12 +102,18 @@ ApplicationWindow {
         }
 
         ContentWrapper {
+            id: contentWrapper
             colorScheme: root.colorScheme
             backend: root.backend
+            notifications: root.notifications
 
             Layout.fillHeight: true
             Layout.fillWidth: true
 
+            onShowSetupGuide: {
+                root.showSetup(user,address)
+            }
+
             onLogin: {
                 root.login(username, password)
             }
@@ -161,7 +158,7 @@ ApplicationWindow {
             Layout.fillWidth: true
 
             onDismissed: {
-                root.showSetup(null)
+                root.showSetup(null,"")
             }
         }
     }
@@ -169,5 +166,25 @@ ApplicationWindow {
     NotificationPopups {
         colorScheme: root.colorScheme
         notifications: root.notifications
+        mainWindow: root
+    }
+
+    function showLocalCacheSettings() { contentWrapper.showLocalCacheSettings() }
+    function showSettings() { contentWrapper.showSettings() }
+    function showHelp() { contentWrapper.showHelp() }
+
+    function showSignIn(username) {
+        if (contentLayout.currentIndex == 1) return
+        contentWrapper.showSignIn(username)
+    }
+
+    function showSetup(user, address) {
+        setupGuide.user = user
+        setupGuide.address = address
+        if (setupGuide.user) {
+            contentLayout._showSetup = true
+        } else {
+            contentLayout._showSetup = false
+        }
     }
 }