Add an option to enable/disable for App/Window switcher separately

[YalandHong]

This issue is somewhat complement to #5.

Thanks so much for such an awesome plugin.

However, this extension is by default enabled for both the App switcher and Window switcher.

I personally want this extension to be enabled only for window switcher, not for app switcher. That is, I can still use Win+Tab to cycle through the windows on different monitors.

I wonder if it is convient to add an option for this.

Thank!