Shopping Cart feature for Events and Workshops

This is totally new feature and comes based from event organizers.
We do have several Event organizers using our events and workshop registration calendar. Now when someone wants to book more then one workshop/event they needed to book and pay for each workshop separate. This was kind of cumbersome, so we added a shopping cart for Events/Workshops so that you can add all your registrations and then check out on the end and pay for all of them on the end.