libtracker-common: Removed all unused type utils functions

Includes:

gchar *  tracker_glong_to_string               (glong         i);
gchar *  tracker_gint_to_string                (gint          i);
gchar *  tracker_guint_to_string               (guint         i);
gchar *  tracker_gint32_to_string              (gint32        i);
gchar *  tracker_guint32_to_string             (guint32       i);
gboolean tracker_string_to_uint                (const gchar  *s,
                                                guint        *ret);
gchar *  tracker_string_list_to_string         (gchar       **strv,
                                                gsize         length,
                                                gchar         sep);
GList *  tracker_glist_copy_with_string_data   (GList        *list);
gchar *  tracker_string_boolean_to_string_gint (const gchar  *value);