Fix asn1_integer_null_data_test()

The failed variable was erroneously initialized to 0, making this test
always pass.

From Christian Andersen, thanks!

Add regress coverage for ASN1_STRING_cmp()

Add some regress coverage for various ASN1_STRING types to codify some
quirks and invariants.

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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Convert from %i to %d

Ensure a constructed ASN.1 INTEGER is considered invalid when decoding.

Add regress test for the encoding of an ASN1_INTEGER with NULL data.

Check pointer argument after {d2i,i2d}_ASN1_{BIT_STRING,BOOLEAN,INTEGER}()

Add regress for ASN1_INTEGER_{get,set}_{u,}int64()

Add regress for ASN1_INTEGER_cmp()

Enable ASN.1 INTEGER tests with invalid lengths/encodings.

Add ASN1_INTEGER test coverage.

Rework Makefile to use regress framework and link asn1basic statically.
It will need this for testing {d2i,i2d}_ASN1_BOOLEAN which will be
moved to internal-only in the upcoming bump.

Add regress tests for ASN1_BIT_STRING.

fix typo: boolean true should decode to 1, not 0

Add initial tests for coverage of ASN.1 basic/primitive types.