feat: news and notifications page (#1660)

* Add news and notifications

* Add localization for news and notifications

* Remove news caching

* Add fetching news befor openning news page

* Fix not updating news page

* Delete debug output

* Remove news and notificztions with only self-hosted servers

* Add stack filters to fetching news request

* Add fetching news with changing stack in the client

* small refactoring

* polishing

* Rename newsModel files and fix naming in code

* fix: remove custom signals; fetch news only on stack expansion

* chore: delete unnecessary code

* chore: code style fixes

* fix: fixed memory leak in gateway controller

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Co-authored-by: vkamn <vk@amnezia.org>

client/ui/qml/Pages2/PageStart.qml

@@ -380,7 +380,13 @@ PageType {
             objectName: "settingsTabButton"
 
             isSelected: tabBar.currentIndex === 2
-            image: "qrc:/images/controls/settings.svg"
+            image: (ServersModel.hasServersFromGatewayApi && NewsModel.hasUnread) ? "qrc:/images/controls/settings-news.svg" : "qrc:/images/controls/settings.svg"
+            Binding {
+                target: settingsTabButton
+                property: "defaultColor"
+                value: "transparent"
+                when: (ServersModel.hasServersFromGatewayApi && NewsModel.hasUnread)
+            }
             clickedFunc: function () {
                 tabBarStackView.goToTabBarPage(PageEnum.PageSettings)
                 tabBar.currentIndex = 2