GtkMisc is a base class bequeathing alignment
and padding properties and related methods to its descendants.
Most widgets do not have such properties on their own account, and
only get them through being packed into a multiple container such as
the GtkBox family members or
GtkTable, or else through using the
GtkAlignment widget which is designed to lend
a facsimile of these properties to its child widget.
It is therefore rare in GTK+ to find a widget capable of calling its
own alignment and padding properties directly, and only
GtkMisc descendants are able to do so.
This is an abstract base class, and cannot be directly constructed.
