This will add ~5m to the build time, but Travis CI SUCK at keeping their tools up to date...

* Put AES ctx on the heap

This forces people to use the ``ctx_release`` functions, because otherwise there will be leaks

* Put fips202 on the heap

* Add much more docs for fips202.h

* fixup! Put fips202 on the heap

* Put SHA2 on the heap-supporting API

* Fix clang-tidy warnings

* Fix unreachable free() in falcon

* Fix McEliece8192128f-sse GNU Makefile

* Fix alignment problems with vectors

* Fix required CPU flags for McEliece

* Fix McElice8192128f that was missed in #259

* fixup! Fix McElice8192128f that was missed in #259

* Fix initialization

* Add McEliece reference implementations

* Add Vec implementations of McEliece

* Add sse implementations

* Add AVX2 implementations

* Get rid of stuff not supported by Mac ABI

* restrict to two cores

* Ditch .data files

* Remove .hidden from all .S files

* speed up duplicate consistency tests by batching

* make cpuinfo more robust

* Hope to stabilize macos cpuinfo without ccache

* Revert "Hope to stabilize macos cpuinfo without ccache"

This reverts commit 6129c3cabe.

* Just hardcode what's available at travis

* Fixed-size types in api.h

* namespace all header files in mceliece

* Ditch operations.h

* Get rid of static inline functions

* fixup! Ditch operations.h

Having the keys on the stack increases the stack space consumption by
quite a bit, and this in turn results in the sanitizer tests failing
for Rainbow.

Moving the keys to the heap in the test seems like a harmless change.

* Add state destroy to SHA2 API

* Include optimized SPHINCS+ implementations

I've generated new implementations from the sphincsplus repository.

* Don't destroy sha256ctx after finalize

* Attempt to shut up MSVC

* Make sure to drop errors in rmtree

* remove automatically checked property

* Allow PR-submitters to self-document.

We don't ever use these, so allow submitters of PRs to self-document.

* Add ccache to speed up builds

* Fix circleci config

* fixup! Fix circleci config

* Try again with environment variables

* Set up ccache on MacOS

Every .s file is now handled through CC

CircleCI has AVX512 support and the compiler will generate instructions that Valgrind doesn't handle.

In light of #251