Move RSImage-AppIcons to Images module.

Modules/Images/Sources/Images/RSImage-AppIcons.swift

@@ -0,0 +1,37 @@
+//
+//  RSImage-AppIcons.swift
+//  NetNewsWire
+//
+//  Created by Nate Weaver on 2019-12-07.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import Core
+import Images
+
+extension RSImage {
+	static let appIconImage: RSImage? = {
+		#if os(macOS)
+		return RSImage(named: NSImage.applicationIconName)
+		#elseif os(iOS)
+		// https://stackoverflow.com/a/51241158/14256
+        if let icons = Bundle.main.infoDictionary?["CFBundleIcons"] as? [String: Any],
+            let primaryIcon = icons["CFBundlePrimaryIcon"] as? [String: Any],
+            let iconFiles = primaryIcon["CFBundleIconFiles"] as? [String],
+            let lastIcon = iconFiles.last {
+            return RSImage(named: lastIcon)
+        }
+		return nil
+		#endif
+	}()
+}
+
+extension IconImage {
+	@MainActor static let appIcon: IconImage? = {
+		if let image = RSImage.appIconImage {
+			return IconImage(image)
+		}
+		return nil
+	}()
+}