Include winapi/config.hpp as soon as possible; avoid including even
Boost.Config before it so that it doesn't set Windows API version
accidentally by including some third party header. In all source files,
include detail/config.hpp or detail/setup_config.hpp first thing.
Moved all WinAPI config macros to the Jamfile.v2 and removed
windows_version.hpp as it was no longer needed. Also enabled inclusion of
windows.h while compiling the library.
Removed auto-linking with psapi.lib and advapi32.lib as it was no longer
working after ecf3114. Added linking with advapi32.lib to Jamfile.v2.
The updated implementation relies on Boost.Atomic for atomic operations which provides better portability. On Linux the implementation uses futexes directly, which should improve performance slightly. The event implementation choice should be more stable across different compiler versions because of these changes.
