RHStatusItemView
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_statusItem dangles and setup + unsquashing of status image.
[FIXED] _statusItem wasn't retained. [FIXED] It's silly to make the application set up the status item's highlightMode and view; RHStatusItemView doesn't work properly without and can do it fine itself. [FIXED] Don't squash status image; center-crop, like the default behavior of NSStatusItem.image.
Also, don't use alternateImage unless it's actually set.