Remove any dependencies on App from the spaces module.

Remove any dependencies on App from the spaces module. This requires moving some dialogs either to spaces, or libneochat if they're used more generically.

src/libneochat/qml/CreateSpaceDialog.qml

@@ -0,0 +1,64 @@
+// SPDX-FileCopyrightText: 2023 Tobias Fella <tobias.fella@kde.org>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-or-later OR LicenseRef-KDE-Accepted-GPL
+
+import QtQuick
+import QtQuick.Controls as QQC2
+import QtQuick.Layouts
+
+import org.kde.kirigami as Kirigami
+import org.kde.kirigamiaddons.formcard as FormCard
+import org.kde.kirigamiaddons.labs.components as Components
+
+import org.kde.neochat
+
+Kirigami.Dialog {
+    id: root
+
+    property string parentId
+
+    required property NeoChatConnection connection
+
+    signal newChild(string childName)
+
+    title: i18nc("@title", "Create a Space")
+    implicitWidth: Kirigami.Units.gridUnit * 20
+    standardButtons: Kirigami.Dialog.Cancel
+
+    Component.onCompleted: roomNameField.forceActiveFocus()
+
+    customFooterActions: [
+        Kirigami.Action {
+            icon.name: "list-add-symbolic"
+            text: i18nc("@action:button Create new space", "Create")
+            enabled: roomNameField.text.length > 0
+            onTriggered: {
+                root.connection.createSpace(roomNameField.text, "", root.parentId, newOfficialCheck.checked);
+                root.newChild(roomNameField.text);
+                root.close();
+            }
+        }
+    ]
+
+    ColumnLayout {
+        spacing: Kirigami.Units.largeSpacing
+
+        FormCard.FormTextFieldDelegate {
+            id: roomNameField
+            label: i18nc("@info:label Name of the space", "Name:")
+            placeholderText: i18nc("@info:placeholder", "New Space")
+        }
+
+        FormCard.FormDelegateSeparator {
+            above: roomNameField
+            below: newOfficialCheck
+            visible: newOfficialCheck.visible
+        }
+
+        FormCard.FormCheckDelegate {
+            id: newOfficialCheck
+            visible: root.parentId.length > 0
+            text: i18nc("@option:check As in make the space from which this dialog was created an official parent.", "Make this parent official")
+            checked: true
+        }
+    }
+}