Changes NewsCollectionViewCell image aspect ratio to 3:2

Also updates fonts to use dynamic text styles.

AltStoreCore/Model/NewsItem.swift

@@ -82,6 +82,16 @@ public class NewsItem: NSManagedObject, Decodable, Fetchable
     }
 }
 
+public extension NewsItem
+{
+    var globallyUniqueID: String? {
+        guard let sourceIdentifier = self.sourceIdentifier else { return nil }
+        
+        let globallyUniqueID = self.identifier + "|" + sourceIdentifier
+        return globallyUniqueID
+    }
+}
+
 public extension NewsItem
 {
     @nonobjc class func fetchRequest() -> NSFetchRequest<NewsItem>