https://github.com/oragono/oragono/blob/80bee85c454fd4c0c9fc71d05f054fbca3d64e7d/oragono.yaml#L516

We can just normalize this out during config parsing --- strings.TrimPrefix(capab, "oper:") on everything --- and then change all the references in the code to remove oper:.

What was the original purpose of this?