* Disable deprecation warnings in cmakelists.txt to avoid introducing new concepts; removed unnecessary uses of get_env.hpp
* Removed use of GetEnvHelper from AMQP samples
* Removed special case for get_env.hpp
* Standardized header ordering for C++ repo
* Reordered categories to move private headers above public headers; added space between categories to enable future flexibility
* Split out attestation client factory into separate class
* Updated readme; clang-format
* Final set of API review changes
* Replaced () constructors with {} constructors
