Show all keys for a product name

[axunonb]

This project is exactly what I was looking for. Thanks a lot!

I thought it was maybe more useful to group the products by their name and show all the corresponding keys.
This way, the number of listed "products" becomes must shorter.

Before (keys removed):

With this PR (keys removed):

As soon as a product is selected, all keys will be copied to the clipboard, e.g.

Windows 10 Professional:

XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (Retail)
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (Retail)
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (Retail)

So the keys don't have to be copied one by one.

[rnelson]

Love it, thank you!