Configure project to automatically copy needed files

See src/CS426_Project.vcxproj for details. Files in images\, audio\,
images\si\ as well as glew32.dll, SDL2.dll and SDL2_mixer.dll get moved.

Work on #72 it does not yet fully work on Release.
All builds now use the same directory

Release is still broken
Merge remote-tracking branch 'origin/master' into auto-move-files
Merge pull request #73 from jhaslowh/auto-move-files

Configure project to automatically copy needed files