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/users/users_delete_test.go

@@ -38,7 +38,9 @@ func TestDeleteUser(t *testing.T) {
 		m.credentialsStore.EXPECT().Logout("user").Return(testCredentialsDisconnected, nil),
 		m.credentialsStore.EXPECT().Delete("user").Return(nil),
 	)
+	m.eventListener.EXPECT().Emit(events.UserRefreshEvent, "user")
 	m.eventListener.EXPECT().Emit(events.CloseConnectionEvent, "user@pm.me")
+	m.eventListener.EXPECT().Emit(events.UserRefreshEvent, "user")
 
 	err := users.DeleteUser("user", true)
 	r.NoError(t, err)
@@ -61,7 +63,9 @@ func TestDeleteUserWithFailingLogout(t *testing.T) {
 		m.credentialsStore.EXPECT().Delete("user").Return(nil),
 	)
 
+	m.eventListener.EXPECT().Emit(events.UserRefreshEvent, "user")
 	m.eventListener.EXPECT().Emit(events.CloseConnectionEvent, "user@pm.me")
+	m.eventListener.EXPECT().Emit(events.UserRefreshEvent, "user")
 
 	err := users.DeleteUser("user", true)
 	r.NoError(t, err)