Added BtPhystest for Bullet Physics test project.

are doing.

software is installed.

tarball.

make sure each .vcxproj file is with its corresponding source code.

changing a configuration variable in a file.

transformed to C++ but aren't compiled into the project yet.

through a list of files containing spaces or parens.

cannot used DirectX 10 because my video card only supports DX9, and there
is no compatibility layer. DX11 has feature levels for older hardware so
it would work with a DX9 card, but it's not available for WinXP.