* Added Gtk::true() and Gtk::false(). Yes, these are just what they look
like - functions that return true and false. Handy for certain callbacks.
* Fixed connect_object() semantics, it only requires two arguments now.
* Standardized all callback marshallers - callbacks are now smoother than
Jennifer Alba's bottom and they all take user supplied extra arguments.
* Moved callback validation right up to the call time, so that callbacks
included from other files could be used as well.
* This necessitated better error messages - so now if it the callback is
not valid, the filename and line number where it was specified are shown.
* Updated gtk.php and list.php to use connect_object() as an example.
to use of constant PHP_OS,
$OS didnt work for detecting windows here,
and i couldnt find any documentation about it.
PHP_OS is a constant which shows right OS...
* Fixed enum/flags code generation properly
* Fixed a bug that would not recognize default value of 0
* Added GtkList::append_items method
* Added a couple of example scripts
