Implement basic developer tools

src/qml/Page/DevtoolsPage.qml

@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2022 Tobias Fella <fella@posteo.de>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick 2.15
+import QtQuick.Controls 2.15 as QQC2
+
+import org.kde.kirigami 2.20 as Kirigami
+import org.kde.neochat 1.0
+
+Kirigami.ScrollablePage {
+    id: devtoolsPage
+
+    property var room
+
+    title: i18n("Room State - %1", room.displayName)
+
+    ListView {
+        anchors.fill: parent
+        model: StateModel {
+            room: devtoolsPage.room
+        }
+
+        delegate: Kirigami.BasicListItem {
+            text: model.type
+            subtitle: model.stateKey
+            onClicked: applicationWindow().pageStack.pushDialogLayer('qrc:/MessageSourceSheet.qml', {
+                sourceText: model.source
+            }, {
+                title: i18n("Event Source"),
+                width: Kirigami.Units.gridUnit * 25
+            });
+        }
+    }
+}