Breaking API changes coming

[05nelsonm]

I am sad to write that, the API needs to be broken in order to fix a severe bug with Java 9 Modules. JPMS does not allow split packages and, as such, the package names that I used in core and MACs libraries are conflicting.

See: KotlinCrypto/core#47 for more info.

core:
The digest, mac, and xof modules need to have their package names changed

hash:
I think we're good, no changes needed.

MACs:
The hmac, md-5, sha1, sha2, sha3, kmac modules need to have their package names changed.

[05nelsonm]

It's either fix it now while the libraries are young, or fix it later. Gotta rip the band-aid off either way.