I combined reference counting with the get_footer() function to make
using it easier (no manual reference counting). put_footer() will
deallocate the widget if the reference count is 0 (this is already done
by the g_object_unref() function) so it should work in a sane way.
Calling the remove() function will destroy the footer if it has no other
references. To prevent this, I need to call g_object_ref() add a
reference to the widget.
I think ocarina/ is a better name for this directory, and now that I've
named the executable "ocarina.bin" I can do this again. I also added
functions for creating a page footer with the basic controls.
