Add gamepad navigation support for everything except context menus and dialogs

app/gui/NavigableMenuItem.qml

@@ -2,6 +2,10 @@ import QtQuick 2.0
 import QtQuick.Controls 2.2
 
 MenuItem {
+    // Ensure focus can't be given to an invisible item
+    enabled: visible
+    height: visible ? implicitHeight : 0
+
     Keys.onReturnPressed: {
         triggered()
     }