Simplify output for UInt's

Fix incorrect rand_int output

Fix spelling in comments

Add WIP warning

Update README with latest perf

Add BE safety net

Provide direct output UInt's

Focus perf benchmarks on implemented methods

Direct method for UInt64 outputs

Improve output formatting

Provide perf output for signed ints

Fix typo

Support direct range generation

Format (via crystal tool format)

Update README with benchmarks

Neaten up benchmark tools

Add spec for wyrand output

Fix incorrect license in shard.yml

Remove non mul128 implementation

Improve PRNG, add docs