* Default CMAKE_BUILD_TYPE to Release
* Use CMAKE_BUILD_TYPE to define _DEBUG (NDEBUG is more standard though,
but cmake defines it)
* Drop LWS_WITHOUT_DEBUG (use CMAKE_BUILD_TYPE for that)
* Drop LWS_NO_EXTERNAL_POLL (was not used)
* Drop CMAKE_BUILD (CMake is the only build system now)
* Add LWS_WITH_STATIC and LWS_WITH_SHARED to choose what version(s) to
build
* Add LWS_XXX_LIBRARIES and LWS_XXX_INCLUDE_DIRS for each library
dependency (zlib, openssl, libev, cyassl)
* Support setting of XXX_LIBRARIES, XXX_LIBRARIES and XXX_INCLUDE_DIRS
by parent project (when included with add_subdirectory())
* Rename LWS_USE_EXTERNAL_ZLIB to LWS_USE_BUNDLED_ZLIB and default it to
NO (since it's Windows only)
* Default LWS_WITHOUT_DAEMONIZE to NO (since network lib shouldn't know
how to do it anyway)
* Rename config.h.cmake to lws_config.h.in
* Rename shared library to websockets_shared so linker will not be
confused
* Fix inline keyword detection in clang
* Explicitly set MACOSX_RPATH to YES on MacOS
