eisenwave / std-big-int / 25015313828

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Add more fast paths and remove inf detection (#155)

Single limbs and two limbs should be common cases, so it is worth detecting those and choosing a fast path.
In particular, on 32-bit, two two-limb case would correspond to the builtin uint64_t-to-floating conversion.

The infinity detection at the end is redundant because the lower-level compose_float function will also produce infinity in the same case.

As a drive-by a latent bug is fixed: `width<T>` and `width_v<T>` cannot be used with MSVC `std::_Signed128` and `std::_Unsigned128`.

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