* Move copy_from_xkcp/CMakeLists.txt out of copy_from_xkcp/package.sh
* Namespace xkcp_low implementations for dist builds
* Run-time dispatching of sha3 calls
* Disable sha3 avx2 on windows
* Replace OQS_PORTABLE_BUILD with OQS_DIST_BUILD
Also introduces OQS_OPT_TARGET and removes OQS_USE_CPU_EXTENSIONS
* Only compile sha3 avx2 code on Linux|Darwin
* Use new ARCH_ARM[X] flags in SIKE CMakeLists
* Update test_portability and rename to test_distbuild
* Update documentation for building Windows AMD64 from Ubuntu Bionic
* Update scripts/build-android.sh
* More specific CMAKE_SYSTEM_PROCESSOR for rasppi toolchain
* CI: Use OQS_DIST_BUILD in some jobs
* Replace OQS_get_available_CPU_extensions by OQS_CPU_has_extension
* ARM64v8/ARM32v7 runtime cpu feature detection
* Compile-time detection of some ARM features
* Toolchain files to cross compile for ARM32v7 and ARM64v8
* Remove unnecessary references to CMAKE_BUILD_TYPE=Release
* Use OQS_DIST_BUILD=ON on Windows
* sha3: remove old implementations
* sha3: new implementations
* picnic: use liboqs sha3 and sha3x4
* frodo: use new sha3x4 interface
* sphincs: use liboqs sha3x4
* fixup
* skip test_spdx on xkcp_low directory
* xkcp_sha3: explicit casts to avoid narrowing warnings
* xkcp_sha3x4: explicit casts to avoid narrowing warnings
* sha3: disable platform specific xkcp if OQS_PORTABLE_BUILD
* sha3: fix Wcast-qual warnings on clang-9
* fix 'reset' functions
* xkcp_sha3: skip fastloop call if input is not long enough
* xkcp_low: Enable lane complementing for plain-64bits
* xkcp_low: remove Kravatte definitions from times4/avx2
* Add common OQS_MEM_aligned_alloc and OQS_MEM_aligned_free
* Require both OQS_USE_OPENSSL and OQS_USE_SHA3_OPENSSL to enable OpenSSL's SHA3
* Fix some undefined behaviour in KeccakP-1600/plain-64bits
* Fix some undefined behaviour in KeccakP-1600times4/avx2
* Expand shake tests
* Add sha3x4.h include to oqs.h
* Add xkcp_low license info to readme [skip-ci]
* Add copy_from_xkcp scripts [skip-ci]
* SPDX License Info for new scripts [skip-ci]
