This directory contains external projects, taken from the following locations:
googletest: https://github.com/google/googletest/tree/4e4df226fc197c0dda6e37f5c8c3845ca1e73a49
 - changed: added NOLINT comment as workaround for clang-tidy warning https://github.com/google/googletest/issues/853
spdlog: https://github.com/gabime/spdlog/tree/v0.16.3/include/spdlog
cryptopp: https://github.com/weidai11/cryptopp/tree/CRYPTOPP_8_2_0
 - changed: added CMakeLists.txt and cryptopp-config.cmake from https://github.com/noloader/cryptopp-cmake/tree/CRYPTOPP_8_2_0
 - changed: commented out line including winapifamily.h in CMakeLists.txt
 - changed: In CMakeLists.txt, rename BUILD_TESTING to CRYPTOPP_BUILD_TESTING so it doesn't clash with our BUILD_TESTING