[ADD] News, Browse and Settings views ported to SwiftUI

This commit contains WIP SwiftUI versions of most of the views in SideStore.

AltStore/Protocols/NavigationTab.swift

@@ -0,0 +1,21 @@
+//
+//  NavigationTab.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import Foundation
+
+protocol NavigationTab: RawRepresentable, Identifiable, CaseIterable, Hashable where RawValue == Int {
+    static var defaultTab: Self { get }
+    var displaySymbol: String { get }
+    var displayName: String { get }
+}
+
+extension NavigationTab {
+    var id: Int {
+        self.rawValue
+    }
+}