Change Settings to singleton and add AutoMouseArea.

Also fixes acceptInvitation issue.

qml/MatriqueSettings/MatriqueSettings.qml

@@ -0,0 +1,13 @@
+pragma Singleton
+import QtQuick 2.9
+import Qt.labs.settings 1.0
+
+Settings {
+    property bool lazyLoad: true
+    property bool asyncMessageDelegate
+    property bool richText
+    property bool pressAndHold
+
+    property bool darkTheme
+    property bool miniMode
+}