Change Settings to singleton and add AutoMouseArea.

Also fixes acceptInvitation issue.

qml/component/AutoMouseArea.qml

@@ -0,0 +1,12 @@
+import QtQuick 2.9
+import MatriqueSettings 0.1
+
+MouseArea {
+    signal primaryClicked()
+    signal secondaryClicked()
+
+    propagateComposedEvents: true
+    acceptedButtons: MatriqueSettings.pressAndHold ? Qt.LeftButton : (Qt.LeftButton | Qt.RightButton)
+    onClicked: mouse.button == Qt.RightButton ? secondaryClicked() : primaryClicked()
+    onPressAndHold: MatriqueSettings.pressAndHold ? secondaryClicked() : {}
+}