Unlike the Scoped* types, bssl::UniquePtr is available to C++ users, and
offered for a large variety of types.  The 'extern "C++"' trick is used
to make the C++ bits digestible to C callers that wrap header files in
'extern "C"'.

Change-Id: Ifbca4c2997d6628e33028c7d7620c72aff0f862e
Reviewed-on: https://boringssl-review.googlesource.com/10521
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

This reverts commit 09feb0f3d9.

(In order to make WebRTC happy this also needs to be reverted.)

This reverts commits:
8d79ed6740
19fdcb5234
8d79ed6740

Because WebRTC (at least) includes our headers in an extern "C" block,
which precludes having any C++ in them.

Change-Id: Ia849f43795a40034cbd45b22ea680b51aab28b2d

This change scatters the contents of the two scoped_types.h files into
the headers for each of the areas of the code. The types are now in the
|bssl| namespace.

Change-Id: I802b8de68fba4786b6a0ac1bacd11d81d5842423
Reviewed-on: https://boringssl-review.googlesource.com/8731
Reviewed-by: Adam Langley <agl@google.com>

We currently have the situation where the |tool| and |bssl_shim| code
includes scoped_types.h from crypto/test and ssl/test. That's weird and
shouldn't happen. Also, our C++ consumers might quite like to have
access to the scoped types.

Thus this change moves some of the template code to base.h and puts it
all in a |bssl| namespace to prepare for scattering these types into
their respective headers. In order that all the existing test code be
able to access these types, it's all moved into the same namespace.

Change-Id: I3207e29474dc5fcc344ace43119df26dae04eabb
Reviewed-on: https://boringssl-review.googlesource.com/8730
Reviewed-by: David Benjamin <davidben@google.com>

Windows is, not unreasonably, complaining that taking abs() of an unsigned is
ridiculous. But these values actually are signed and fit very easily in an int
anyway.

Change-Id: I34fecaaa3616732112e3eea105a7c84bd9cd0bae
Reviewed-on: https://boringssl-review.googlesource.com/8144
Reviewed-by: Adam Langley <agl@google.com>

Otherwise builds fail with:
  crypto/newhope/newhope_statistical_test.cc:136:27: error: format specifies type 'long' but the argument has type 'uint64_t' (aka 'unsigned long long') [-Werror,-Wformat]

Change-Id: I85d5816c1d7ee71eef362bffe983b2781ce310a4

One of these tests the distribution of noise polynomials; the other
tests that that agreed-upon keys (prior to whitening) have roughly equal
numbers of 0s and 1s.

Along the way, expose a few more API bits.

Change-Id: I6b04708d41590de45d82ea95bae1033cfccd5d67
Reviewed-on: https://boringssl-review.googlesource.com/8130
Reviewed-by: Adam Langley <agl@google.com>