distutils environment variables for all versions of python, not just conda.

Now PYTHON_INCLUDE_DIR and PYTHON_LIBRARY setting up correctly for both 32/64 bit architectures

When cmake is not found, the error message suggests what to do to
install cmake. But if `distro` is not found and cannot be installed,
the distro specific error message cannot be shown. Hence, we simply
ignore this and continue on.

Also, make the pip install quiet so that if there is an error message
in that, the user does not get confused by it.

If cmake_path is not found, either cmake is not installed
or cmake is not in the PATH. Hence, we also give instructions
on how to install cmake if the path is not found.

When python does not know the encoding of stdout, sys.stdout.encoding
is None.  Then calling decode(None) raises an exception.  We just
skip decoding when the encoding is unknown.

Please use sys.stdout.encoding instead of latin-1 in setup.py.
This is necessary for non English OS.

screen.  In particular, that caused cmake's error messsages to be truncated if
the build failed.

dlib/CMakeLists.txt file is keeping the version numbers.  Also changed all
relevant scripts to grab the version information from CMakeLists.txt.

if no cmake generator is set use same logic as cmake to find default buid generator but use Win64 if the build is for 64bit Python

avoid foreign artifacts potentially left over from VM builts.

make sure --cmake can be used to pass any cmake not in the path.