Migrate to C++17

1. ::type -> _t
2. ::value -> _v
3. if constexpr where appropriate
4. [[nodiscard]] where appropriate
5. [[fallthrough]] and no default: where appropriate
6. [[maybe_unused]] where appropriate
7. structured bindings where appropriate
8. integral_constant<bool> -> bool_constant
9. void_t
10. static_assert with no args
11. emplace instead of push_back

• src/pn532/channel.cpp
• src/pn532/i2c.cpp
• src/pn532/data.cpp
• src/pn532/hsu.cpp
• src/pn532/nfc.cpp
• src/pn532/desfire_pcd.cpp
• src/pn532/msg.cpp
• src/desfire/cipher_impl.cpp
• src/desfire/data.cpp
• src/desfire/tag.cpp
• src/desfire/cipher_scheme_legacy.cpp
• src/desfire/crypto_algo.cpp
• src/desfire/msg.cpp
• src/unittest_transport.h
• src/test/utils.cpp
• src/test/utils.hpp
• src/test/main.cpp
• examples/select_tag.cpp
• examples/selftest.cpp
• examples/initialize.cpp
• include/pn532/log.h
• include/pn532/bits.hpp
• include/pn532/channel.hpp
• include/pn532/data.hpp
• include/pn532/bits_algo.hpp
• include/pn532/hsu.hpp
• include/pn532/nfc.hpp
• include/pn532/desfire_pcd.hpp
• include/pn532/msg.hpp
• include/pn532/i2c.hpp
• include/desfire/log.h
• include/desfire/tag.hpp
• include/desfire/key_actor.hpp
• include/desfire/controller.hpp
• include/desfire/bits.hpp
• include/desfire/cipher_scheme_legacy.hpp
• include/desfire/data.hpp
• include/desfire/crypto_algo.hpp
• include/desfire/cipher_impl.hpp
• include/desfire/cipher.hpp
• include/desfire/msg.hpp
• include/desfire/cipher_scheme.hpp
• include/mlab/byte_order.hpp
• include/mlab/any_of.hpp
• include/mlab/result.hpp
• include/mlab/bin_data.hpp