Update GNCGeneralSelect to be based on GObject system

[Stephen Evanchik]

Moved GNCGeneralSelect to the new GObject system:

        * src/gnome-utils/gnc-general-select.h:
          Removed #include <glib-object.h>
	  Added #include <glib.h>
	  Added private member 'disposed' to GNCGeneralSelect
        * src/gnome-utils/gnc-general-select.c:
	  Converted the following functions to use GObject:
                gnc_general_select_get_type,
                gnc_general_select_class_init
          Added gnc_general_select_dispose function that handles 
          child widget destruction
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