Email and Share icons

Although at the time of writing, Email will crash on 15

App/Backend/History/ShareableURL.swift

@@ -0,0 +1,39 @@
+//
+//  ShareableURL.swift
+//  App
+//
+//  Created by James Magahern on 4/28/21.
+//
+
+import Foundation
+
+class ShareableURL : NSObject, UIActivityItemSource
+{
+    let url: URL
+    let title: String
+    let favicon: UIImage?
+    
+    init(url: URL, title: String, favicon: UIImage?) {
+        self.url = url
+        self.title = title
+        self.favicon = favicon
+        
+        super.init()
+    }
+    
+    func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
+        return self.url
+    }
+    
+    func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
+        return self.url
+    }
+    
+    func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivity.ActivityType?) -> String {
+        return self.title
+    }
+    
+    func activityViewController(_ activityViewController: UIActivityViewController, thumbnailImageForActivityType activityType: UIActivity.ActivityType?, suggestedSize size: CGSize) -> UIImage? {
+        return self.favicon
+    }
+}