When multiple notifications are open and one notification in the
beginning or in the middle is closed the location of the remaining
notification windows are updated so that there is no gap between them.
We currently use icon paths for this because I didn't want to deal with
implementing icon bitmap sharing right now. In the future it would be
better to post a bitmap somehow instead of a path.
Since the returned object is now owned by the callee object, we can
simply vend a ChildType&. This allows us to use "." instead of "->"
at the call site, which is quite nice. :^)
Don't stack notifications on top of each other, instead put them below
one another on the y axis.
This will obviously break if the screen fills with notifications, but
that's a FIXME for now. :^)
This patch adds NotificationServer, which runs as the "notify" user
and provides an IPC API for desktop notifications.
LibGUI gains the GUI::Notification class for showing notifications.
NotificationServer is spawned on demand and will unspawn after
dimissing all visible notifications. :^)
Finally, this also comes with a small /bin/notify utility.
