Add the ability to block roles from Discovery - Opening it to ALL but the list of roles.

[MattTheDev]

1. Create a discovery option that allows you to turn it on for everyone BUT ...
2. Provided role list would be exempt from being discovered.

Existing syntax:

/discovery enable /discovery enable role: roleName

Possible added syntax:

/discovery enable role: roleName bypassRole: roleName (with bulk role addition)