Merge pull request Cyan4973#81 from Cyan4973/dev

fixed minor conversion warnings

Merge pull request Cyan4973#71 from Cyan4973/dev

add `XXH*_copyState()` to list for `XXH_NAMESPACE`

Merge pull request Cyan4973#65 from Cyan4973/dev

updated API for static allocation

Merge pull request Cyan4973#58 from Cyan4973/dev

Dev

Merge pull request Cyan4973#52 from Cyan4973/dev

extra static assert, as suggested by @t-mat

Merge pull request Cyan4973#33 from Cyan4973/dev

Dev

Merge pull request Cyan4973#30 from Cyan4973/dev

Dev

Merge pull request Cyan4973#27 from Cyan4973/dev

Dev

Merge pull request Cyan4973#15 from Cyan4973/dev

Dev

Merge pull request Cyan4973#12 from Cyan4973/dev

xxhsum : can use stdin as input (default)