na-tray: wide panels, convert main GtkBox display to GtkGrid

New grid sorting/display functions to arrange notification area icons in a self reorganising grid
main changes in: item_added_cb(), notification_notify() -> refresh_notify().
update_size_and_orientation() is no longer needed
the grid auto arranges on any size-allocation which includes orientation changes.
Grid is now refreshed with refresh_grid()/determine_grid_properties()/reorder_items_with_data().
based on the min_icon_size property
the main applets' code can call na_grid_set_min_icon_size() to update the grid icon size.

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