* Refactor asSignedWords, kill 130+ lines
* Allow signed int initialization at compiletime.
* inline procs in uint_mul
* Fix an unfortunate shadowing in high(Int)
* Initial commit - allow all ops at compile-time on uint.
* Update benchmark
* Delete commented ideal version of asWordsiterate, it is obvious from the workaround (and is tracked in the PR)
* Start on allowing compile-time stint. Works for Uint256
* remove and reorder initUintImpl, zero and one procs
* Fix assignation of uint64 to 2xuint32, remove unsafeConv and use const for base/radix
* assign_least_significant_words shouldn't implicitly capture result
* Simplify least significant words macros
