Functions - FWNBI

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List functions for work with basic_integer. Includes mathematical and bitwise operations.

**Mathematical functions**
`fullmul`	returns result of multiplication with twice width
`abs`	returns absolute value of integer
`modpow`	returns result of modular exponentiation
`sqr`	returns square of integer with twice width
`isqrt`	returns integer square root
`gcd`	returns greatest common divisor
`lcm`	returns least common multiple

**Bitwise functions**
`rotl rotr`	returns rotated integer
`clz`	returns count of leading zeros
`ctz`	returns count of trailing zeros
`popcount`	returns count of `1`-bits
`byteswap`	flip byte order in integer