Add Alteration Wordlist Config Option

[fork-while-fork]

Implements #157

[dhauenstein]

Maybe the example amass_config.ini should be extended with this new parameter option as well?

[fork-while-fork]

I think I've addressed all your comments @dhauenstein. The only thing that's missing is being able to specify multiple wordlists in the commandline parameter, but I think we're alright with just exposing that advanced configuration in the config file. Let me know what you think!

[dhauenstein]

Yeah, that was quick, awesome!
Regarding the multiple wordlists on the commandline: One way is to separate those with a comma, although I'd agree that putting those in the config file might be a cleaner way, especially this won't be an option that most users will ever need.
Cheers!

[caffix]

Thank you for the excellent contribution!