CMake modernization and improvements

[rrumpf]

· Boost Log pulled in incorrectly via components (should be log log_setup).
· Use of old-style commands (missing target_include_directories, target_compile_definitions, target_compile_options) makes CMake export for install-based config file impossible, as well as having improper separation of concerns.
· Missing CTest integration.
· Missing install-based CMake config file.
· Can use source_group() on windows and folders to organize MSVC project.
· Unclear what point of BUILD_SHARED_LIBS is since resulting library created is always shared. Also, don’t need it on Linux but present anyway.
· Consider modifying usage of cpprest so that Eclipse Unix makefiles are generated on OSX and Linux instead of just makefiles.
· Inclusion of cpprest library done twice… not sure why.
· Consider component-based installer.
· Can also use compiler compatibility/feature detection headers.
· Missing some files in installer – mlclientConfig.h, for example.
· Compiler feature detection compatibility headers.
· Surprised that hardcoded directories don’t get you on Windows…
link_directories(/usr/lib /usr/local/lib /usr/local/opt/openssl/lib )