function compiles the accelerator table into the opaque internal representation.
function installs the accelerators from source onto destination
by augmenting the destination translations with the source accelerators.
If the source display_accelerator method is non-NULL,
calls it with the source widget and a string representation
of the accelerator table,
which indicates that its accelerators have been installed
and that it should display them appropriately.
The string representation of the accelerator table is its
canonical translation table representation.
function recursively descends the widget tree rooted at source
and installs the accelerators of each widget encountered onto destination.
A common use os to call
and pass the application main window as the source.