Marvel Snap cleanup

BUR #45827 has been approved by @nonamethanks.

create implication marvel_snap -> marvel

Forgot to add this to my previous request (BUR #45826)

For what it's worth, you can attach new BURs to a topic by having them open and pressing "Request alias/implication" on your topbar.

thanks

The bulk update request #45827 (forum #377254) has been approved by @nonamethanks.