Add SOCKS support.

[jabberwock]

Add support for SOCKS4 and SOCKS5 proxies via PySocks.

[hypn0s]

Hi @jabberwock , thank you for your PR!

I'm sorry but I won't merge this PR. The reason is that I don't want external dependencies to allow the code to be run anywhere. As the users of this script can not install dependencies, it is easier to let the user uses tools such as tsocks or proxychains.

Anyway, thank you for your PR again, I hope you understand my point of view :)

[jabberwock]

@hypn0s I understand. I did this for my own needs as proxychains doesn't work with Python in many environments due to the nature of glibc's dynamic linker across different versions. I am also testing from macos which doesn't have tsocks natively, or in Homebrew. Thank you for your response and clarification of your goal to keep this awesome program simple.

-jw