Remove #error if OPENSSL_NO_FOO is defined

discussed with jsing

Replace GETU32 and PUTU32.

Replace GETU32 with crypto_load_be32toh() and PUTU32 with
crypto_store_htobe32(). Make the offset handling cleaner at the
same time.

ok beck@ joshua@ tb@

Make header guards of internal headers consistent

Not all of them, only those that didn't leak into a public header...
Yes.

Make internal header file names consistent

Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names
used for internal headers. Move all these headers we inherited from
OpenSSL to *_l

Make internal header file names consistent

Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names
used for internal headers. Move all these headers we inherited from
OpenSSL to *_local.h, reserving the name *_internal.h for our own code.
Similarly, move dtls_locl.h and ssl_locl.h to dtls_local and ssl_local.h.
constant_time_locl.h is moved to constant_time.h since it's special.

Adjust all .c files in libcrypto, libssl and regress.

The diff is mechanical with the exception of tls13_quic.c, where
#include <ssl_locl.h> was fixed manually.

discussed with jsing,
no objection bcook

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