Add Kuznyechik support for VeraCrypt 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

tools/vc_tests/.gitattributes

@@ -0,0 +1 @@
+*.vc binary

tools/vc_tests/hashcat_sha512_kuznyechik-twofish.vc

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tools/vc_tests/hashcat_whirlpool_kuznyechik-aes.vc

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