Integer: add bits(_vartime) and leading_zeros methods
#368
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Adds the following methods: - `bits`: count the number of bits required to represent a given number in constant-time - `bits_vartime`: count the number of bits required to represent a given number in variable-time - `leading_zeros`: count the number of leading zeros in a number, implemented as a provided method which subtracts `bits` from `bits_precision`. This also adds `BoxedUint::bits_vartime`, whereas previously it only had a constant-time implementation.
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Adds the following methods:
bits: count the number of bits required to represent a given number in constant-timebits_vartime: count the number of bits required to represent a given number in variable-timeleading_zeros: count the number of leading zeros in a number, implemented as a provided method which subtractsbitsfrombits_precision.This also adds
BoxedUint::bits_vartime, whereas previously it only had a constant-time implementation.