Adding new features for the main module

[snovvcrash]

Hello there,

In this PR I would like to propose some features for pentest/redteam engagements:

• automatic "crawl & dump" function to spider the SMB share searching for files by a given pattern and download them to disk;
• blind share enumeration with a brute force attack by a wordlist containing some commonly used hostnames;
• encoding fix to allow download files with non-en-US characters in a pathname;
• fake legitimate identifiers (device model, user-agent, etc.) in order to avoid being quarantined by a Blue Team.

There are quite a few changes as well as README.md modifications (was just editing a cheatsheet for myself), so I suppose you might want to create a separate branch for this PR. Let me know if you find it acceptable and I will pull this request once again for a new branch.

More information about the changes: https://snovvcrash.github.io/2020/08/22/tuning-peas-for-fun-and-profit.html