WL-168 When redeeming a Registration Code in the shopping cart, the user should be redirect to the Registration Code Redemption page

@chrisndodge @smagoun 

Kindly review the changes for WL-168

Thanks
The purchase of Registration Codes will be linked to the purchasing Order. That still exists.

Registration Code redemptions don't need to be tied to an Order by the redeemer. That is why this column is being dropped.

There is a RegistrationCodeRedemption table which maps registration codes to who redeemed them and when.