Rename prototype

Posted under Tags

The bulk update request #14181 has been approved by @evazion.

create alias prototype -> prototype_design
remove alias prototype -> prototype_design

Fairly ambiguous name, the tag is for pre-release designs, but I see it being misused as a canon tag for prototype machines every now and then.

Keeping prototype in the name so we don't we don't have to then go and rename every *_(prototype) tag too.