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

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

AltStore/Views/News/NewsView.swift

@@ -0,0 +1,55 @@
+//
+//  NewsView.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+import AltStoreCore
+
+struct NewsView: View {
+    
+    @SwiftUI.FetchRequest(sortDescriptors: [
+        NSSortDescriptor(keyPath: \NewsItem.date, ascending: false),
+        NSSortDescriptor(keyPath: \NewsItem.sortIndex, ascending: true),
+        NSSortDescriptor(keyPath: \NewsItem.sourceIdentifier, ascending: true)
+    ])
+    var news: FetchedResults<NewsItem>
+    
+    @State
+    var activeExternalUrl: URL?
+    
+    @State
+    var selectedStoreApp: StoreApp?
+    
+    var body: some View {
+        ScrollView {
+            LazyVStack(spacing: 24) {
+                ForEach(news, id: \.objectID) { newsItem in
+                    NewsItemView(newsItem: newsItem)
+                        .onNewsSelection { newsItem in
+                            self.activeExternalUrl = newsItem.externalURL
+                        }
+                        .frame(
+                            maxWidth: .infinity,
+                            alignment: .topLeading
+                        )
+                }
+            }
+            .padding()
+        }
+        .background(Color(UIColor.systemGroupedBackground).ignoresSafeArea())
+        .navigationTitle("News")
+        .sheet(item: self.$activeExternalUrl) { url in
+            SafariView(url: url)
+        }
+    }
+}
+
+struct NewsView_Previews: PreviewProvider {
+    static var previews: some View {
+        NewsView()
+    }
+}