Add .gitattributes and .gitignore.

Separate project, separate files.
Update to Visual C++ 2013.

Yeah, I know, I'm still using bullshit proprietary "enterprise" software, but
still, MinGW manages to be even less inviting with their fork confusion and
lack of a comparable debugger.

And hey, you should totally update – from Visual C++ 2010, at least – since
they now reliably include a 64-bit C compiler (finally...) and 4 additional
C99 features (_Bool, compound literals, designated initializers, and variable
declaration placement) Oh, and a bunch of new standard headers. How wonderful.

Aside from the usually shitty installer, that actually was a comparatively
enjoyable update, it only pointed out one bug in my .vcxproj optimizations.
Even better, you don't even necessarily *have* to update your Visual Studio,
as the updated .vcxproj still works with Visual C++ 2010 after changing the
platform toolset option.