Add an option to ignore left click on a notification

[yerlotic]

This PR add the ability to ignore left click on a notification.

Currently when a notification itself (not action button, close button, etc.) receives left click, it closes. It's not always useful, because when trying to reply to a message within the notification, you have to aim input field. Sometimes you miss it and notification closes without an option to restore it or reply after closing.

This PR tries to fix it by introducing an option to ignore left click on notification body.