Implement NIP04: Encrypted Direct Messages

Closes #5

This adds encrypted direct message support to damus

Changelog-Added: Implement NIP04: Encrypted Direct Messages
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Util/InputDismissKeyboard.swift

@@ -0,0 +1,39 @@
+//
+//  InputDismissKeyboard.swift
+//  damus
+//
+//  Created by William Casarin on 2022-07-02.
+//
+
+import Foundation
+import SwiftUI
+
+public extension View {
+    func dismissKeyboardOnTap() -> some View {
+        modifier(DismissKeyboardOnTap())
+    }
+}
+
+public struct DismissKeyboardOnTap: ViewModifier {
+    public func body(content: Content) -> some View {
+        #if os(macOS)
+        return content
+        #else
+        return content.gesture(tapGesture)
+        #endif
+    }
+
+    private var tapGesture: some Gesture {
+        TapGesture().onEnded(endEditing)
+    }
+
+    private func endEditing() {
+        UIApplication.shared.connectedScenes
+            .filter {$0.activationState == .foregroundActive}
+            .map {$0 as? UIWindowScene}
+            .compactMap({$0})
+            .first?.windows
+            .filter {$0.isKeyWindow}
+            .first?.endEditing(true)
+    }
+}