Checkout improvements

1.	Change shipping method selection to radio group		Closed	Denis Lozenko (Inactive)
2.	Change payment method selection to radio group		Closed	Denis Lozenko (Inactive)
3.	Improve payment messaging via dynamic content		Closed	Denis Lozenko (Inactive)
4.	Allows to skip 'state' selection for some countries		Closed	Denis Pavlov
5.	Introduce a separate field for customer and customer address to hold 'salutation'		Closed	Denis Pavlov
6.	Allow configurable address form		Closed	Denis Pavlov