Add import on tvOS, other export/import improvements

Shared/Settings/Import/ImportSettings.swift

@@ -0,0 +1,34 @@
+
+import SwiftUI
+
+struct ImportSettings: View {
+    @State private var fileURL = ""
+
+    var body: some View {
+        VStack(spacing: 100) {
+            VStack(alignment: .leading, spacing: 20) {
+                Text("1. Export settings from Yattee for iOS or macOS")
+                Text("2. Upload it to a file hosting (e. g. Pastebin or GitHub Gist)")
+                Text("3. Enter file URL in the field below. You can use iOS remote to paste.")
+            }
+
+            TextField("URL", text: $fileURL)
+
+            Button {
+                if let url = URL(string: fileURL) {
+                    NavigationModel.shared.presentSettingsImportSheet(url)
+                }
+            } label: {
+                Text("Import")
+            }
+        }
+        .padding(20)
+        .navigationTitle("Import Settings")
+    }
+}
+
+struct ImportSettings_Previews: PreviewProvider {
+    static var previews: some View {
+        ImportSettings()
+    }
+}