Add support for notification "badges" #227
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In fulfillment of #226, this PR adds a
BadgedPixmapclass that overlays a red/circular "badge" onto an arbitrary pixmap that may contain text, at a relative size, and in a corner of the developer's choice. This is intended to be used to highlight the presence of pending or important information within the application, for example, like so (on macOS):Note that this is mostly intended for future purposes; for now, a notification "badge" will only be displayed to signal a pending/unread "newscap" message (however, the same functionality may be used for other/additional purposes later on -- e.g., to communicate software updates, to highlight a magic-folder conflict, to remind users to export a Recovery Key, to notify of an expiring subscription to a commercial service provider, and so on).