Improve room setting

* Port away from OverlaySheet
* Use Kirigami.CategorizedSettings
* Add join rules (read only for now)

imports/NeoChat/RoomSettings/Security.qml

@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: 2019-2020 Black Hat <bhat@encom.eu.org>
+// SPDX-FileCopyrightText: 2021 Carl Schwan <carl@carlschwan.eu>
+// SPDX-License-Identifier: GPL-3.0-only
+
+import QtQuick 2.15
+import QtQuick.Controls 2.15
+import QtQuick.Layouts 1.15
+import org.kde.kirigami 2.15 as Kirigami
+
+import org.kde.neochat 1.0
+import NeoChat.Component 1.0
+import NeoChat.Dialog 1.0
+
+Kirigami.ScrollablePage {
+    id: root
+
+    property var room
+
+    title: i18n('Security')
+
+    ColumnLayout {
+        Kirigami.FormLayout {
+            Layout.fillWidth: true
+
+            CheckBox {
+                text: i18nc("@option:check", "Private (invite only)")
+                Kirigami.FormData.label: i18nc("@option:check", "Access:")
+                checked: room.joinRule === "invite"
+                enabled: false
+            }
+            Label {
+                text: i18n("Only invited people can join.")
+                font: Kirigami.Theme.smallFont
+            }
+            CheckBox {
+                text: i18nc("@option:check", "Space members")
+                checked: room.joinRule === "restricted"
+                enabled: false
+            }
+            Label {
+                text: i18n("Anyone in a space can find and join.")
+                font: Kirigami.Theme.smallFont
+            }
+            CheckBox {
+                text: i18nc("@option:check", "Public")
+                checked: room.joinRule === "public"
+                enabled: false
+            }
+            Label {
+                text: i18nc("@option:check", "Anyone can find and join.") + room.joinRule
+                font: Kirigami.Theme.smallFont
+            }
+        }
+    }
+
+    footer: ToolBar {
+        contentItem: RowLayout {
+            Item {
+                Layout.fillWidth: true
+            }
+            Button {
+                Layout.alignment: Qt.AlignRight
+                enabled: false
+                text: i18n("Apply")
+            }
+        }
+    }
+}
+