[Notifications] Add quick reply feature
This adds a quick reply feature with a text field inline in the notification popup. An action named "inline-reply" will spawn the text field and a NotificationReplied signal is emitted then. There's additional kde hints for changing the placeholder text (defaults to "Type a reply..."), submit button text (defaults to "Send") and submit button icon name (defaults to "document-send", that paper aeroplane icon).
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