Draft: Cleaning status bar feature + Refactoring HUD

This MR contains:

• Removal of ThemeFeature that wasn't used
• Creation of a StatusBarFeature which contains a refactor of the old ThemeFeature.
• Refactor of HUDFeature

Sources/App/AppDelegate.swift

@@ -2,17 +2,18 @@ import UIKit
 import OSLog
 import BackgroundTasks
 
-import Theme
 import XXLogger
 import Defaults
 import Integration
+import ToastFeature
 import SwiftyDropbox
 import CrashReporting
 import PushNotifications
 import DependencyInjection
 
-import OnboardingFeature
 import DropboxFeature
+import StatusBarFeature
+import OnboardingFeature
 
 let logger = Logger(subsystem: "logs_xxmessenger", category: "AppDelegate.swift")
 
@@ -51,11 +52,16 @@ public class AppDelegate: UIResponder, UIApplicationDelegate {
 
         UNUserNotificationCenter.current().delegate = self
 
-        let rootScreen = StatusBarViewController(
-            UINavigationController(rootViewController: OnboardingLaunchController())
+        let rootScreen =
+        StatusBarViewController(
+            ToastViewController(
+                UINavigationController(
+                    rootViewController: OnboardingLaunchController()
+                )
+            )
         )
 
-        window = Window()
+        window = UIWindow()
         window?.rootViewController = rootScreen
         window?.backgroundColor = UIColor.white
         window?.makeKeyAndVisible()