Add Cipherer class

[bleudev]

Description of new feature

Add new class Cipherer with 2 new functions: cipher(number, key, bits=16) and s_cipher(string, key, bits=16) - for simplifying using simple cipher algorithms in your python projects. Cipherer works using xor (number ^ key = answer), but this cipherer uses numbers with fixed amount of bits. Then we need to introduce new class with auto overflow fixer with fixed amount of bits (described in #60). Because of that we need to fix #60 and then this issue.

Use Case (optional)

cipherer(81, 75, bits=8) # number, key, number of bits (optional)
str_cipherer('hello', 75, bits=8) # string, key, number of bits (optional)

# You can realise decipherer using cipherer.

Suggest solution (optional)

Bin(Bin(number, bits=bits) ^ Bin(key, bits=bits), bits=bits)