notificationDaemon: support file:// or icon theme names for image-path
While this sounds counter-intuitive, the image-path hint value might also be used with URIs or icon names.
As per freedesktop standard:
The "app_icon" parameter and "image-path" hint should be either an URI (file:// is the only URI schema supported right now) or a name in a freedesktop.org-compliant icon theme (not a GTK+ stock ID).
Thus the image-path hint should also be parsed as it happens for the app_icon.
Reuse same logic, by falling back on _iconForNotificationData with the hint value.
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This could help for testing too libnotify!4 (merged)
This would break the usage of relative paths, I guess it's fine to do it, but if we have cases we care about, maybe it could be changed.
Edited by Marco Trevisan