Hide public symbols in evp.h

largely mechanically done by the guentherizer 9000

ok tb@

Zap some whitespace

Use more consistent naming for some files in evp

EVP_Digest{Init,Update,Final}() move from digest.c to evp_digest.c which
will become the home of all things related to EVP_MD{,_CTX} handling.

EVP_C

Use more consistent naming for some files in evp

EVP_Digest{Init,Update,Final}() move from digest.c to evp_digest.c which
will become the home of all things related to EVP_MD{,_CTX} handling.

EVP_Cipher{Init,Update,Final}() move from evp_enc.c to evp_cipher.c which
will become the home of all things related to EVP_CIPHER{,_CTX} handling.

EVP_Encode{Init,Update,Final}() move from encode.c to evp_encode.c which
already is the home of EVP_ENCODE_CTX_{new,free}().

discussed with jsing

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