Discount Codes Improvements

'- Add option to copy discount code.

• Add Start Time when using limited time codes.

• Select applicable product versions instead of whole products.

• Requirements, for example:

• Have purchased any or all of a list of products.

• Apply only for purchases of x amount or higher/lower.

• Only works for specific customers.

This changes will make discount codes way more usable, similar to how they work on other platforms and also help solve some problems mentioned in other posts.