Bitwise and, or, xor, and not operators

[muytingc]

Excited to submit my first pull request for the repository. I know harish-vnkt already submitted a pull request for bitwise left and right shifts, but I added the other primary operators suggested in #60 with support for both positive and negative values using two's complement binary numbers. I did my best to follow the other commenting and style conventions from the rest of the project, but I believe there could be some improvements, so I'd love suggestions. I did some basic testing on my own machine, but believe it could use more thorough testing especially in terms of efficiency.