Add functionality to not show subdomains

[lucasRolff]

Currently in SpamExperts® cPanel plugin, in the settings you have the option Process addon-, parked and subdomains

It would be great if this could be split up per domain type, such as addon, parked or subdomain.

As a hosting provider I'd like to not show subdomains - it's bloated, and majority of customers do not actually have emails on subdomains.

I fixed it personally myself by looping over the array returned in the source code, and unset everything where the type is equal subdomain, but having this as a core functionality would be great.