Alpha release supporting major versions of macOS and Windows

The executables in this alpha release have been tested on macOS 10.12 (Sierra), 10.11 (El Capitan), 10.10 (Yosemite), and 10.9 (Mavericks); and on 32-bit and 64-bit versions of Windows 10, 8.1, 7, and Vista. Windows executables are now fully statically linked.