* added credentials API, disabled FFI backend for now
* Added CredentialsTest
* Added support for specifying CMAKE_BUILD_TYPE on the command line
* Added support for AwsCredentials and StaticCredentialsProvider
* Added aws_crt_error_str and test, removed awscrt_version test function
* Added aws_crt_error_name
* Added aws_crt_error_debug_str
* Use PHP's own tools to generate arginfo
* Only re-generate arginfo on php7+
* Added a definition for ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX for php5
* Ignore generated files for clang-format
* mv src -> ext, lib -> src to be more in line with PHP module expectations
* Fixed dependency for ffi test
* Fixed path in format-check to C source
* CRT will now try the extension first, then FFI