Split message content into its own module

This is laying some groundwork for the rich text chatbar.

src/messagecontent/EncryptedComponent.qml

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2021 Tobias Fella <tobias.fella@kde.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick
+import QtQuick.Layouts
+
+import org.kde.kirigami as Kirigami
+
+import org.kde.neochat
+
+/**
+ * @brief A component for an encrypted message that can't be decrypted.
+ */
+TextEdit {
+    Layout.fillWidth: true
+    Layout.maximumWidth: Message.maxContentWidth
+
+    text: i18n("This message is encrypted and the sender has not shared the key with this device.")
+    color: Kirigami.Theme.disabledTextColor
+    selectedTextColor: Kirigami.Theme.highlightedTextColor
+    selectionColor: Kirigami.Theme.highlightColor
+    font.pointSize: Kirigami.Theme.defaultFont.pointSize
+    selectByMouse: !Kirigami.Settings.isMobile
+    readOnly: true
+    wrapMode: Text.WordWrap
+    textFormat: Text.RichText
+}