Implement basefind feature

[XVilka]

Basefind aims at find the base address of a raw binary by using ASCII strings and their intersections.

There are various implementations of this:

• https://github.com/sgayou/rbasefind (in Rust)
• https://github.com/mncoppola/ws30/blob/master/basefind.py (Python)
• https://github.com/mncoppola/ws30/blob/master/basefind.cpp (C++)
• https://gist.github.com/rpw/2c4064712638bce602755a938991e5e9 (Python)

Since Rizin is often used for reversing raw binaries (e.g. firmware) it's commonly used feature in this scenario. It could be a part of the Rizin itself, moreover, reusing the strings detection logic, see #38