Remove unnecessary constant variables by hardcoring values instead of
looking up. Precalculate swaps that are known at compile time. Hardcode
hashes_shown offset as zero for all TC / VC kernels.
Adds support for the Russian cipher specified in GOST R 34.12-2015, also
known as Kuznyechik (Grasshopper).
- Add Kuznyechik header decryption checks to all VeraCrypt kernels
- Add test containers for available Kuznyechik cipher combinations
