Adds history browser view

App/Backend/History/HistoryItem.swift

@@ -7,15 +7,25 @@
 
 import Foundation
 
-struct HistoryItem: Hashable
+struct HistoryItem: Hashable, Identifiable
 {
     var url: URL
     var title: String
     var lastVisited: Date
+    var id: ObjectIdentifier
     
     init(entity: HistoryItemEntity) {
         self.url = entity.url ?? URL(string: "about:blank")!
         self.lastVisited = entity.lastVisited ?? Date()
         self.title = entity.title ?? ""
+        self.id = entity.id
+    }
+    
+    // For testing/previews
+    public init(url: URL, title: String, lastVisited: Date) {
+        self.url = url
+        self.title = title
+        self.lastVisited = lastVisited
+        self.id = ObjectIdentifier(NSUUID())
     }
 }