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/controllers/pageController.h

@@ -26,6 +26,8 @@ namespace PageLoader
         PageSettingsConnection,
         PageSettingsDns,
         PageSettingsApplication,
+        PageSettingsNewsNotifications,
+        PageSettingsNewsDetail,
         PageSettingsBackup,
         PageSettingsAbout,
         PageSettingsLogging,