- The SCons option system is now used for validation
- An help message can now be displayed using `scons -h`
- New `use_mingw` option to compile using MinGW on Windows
- Removed `arch` in favor of `bits`
- Renamed `headers` to `headers_dir`
- Built libraries now contain the target in the file name
This adds MSVC compiler flags to enable the DEBUG/NDEBUG defines, enable exceptions, turn on optimizations for Release builds, and link to the correct runtime library
This ensures that environment variables are kept when on windows meaning you can run it with any version of VS, so long as you are in a VS prompt or have run the vcvars.bat file for your architecture