Project cleanup.

Added sdl_project and glut_project property pages,
so projects no longer depend on system / user environment variables.

Added post-build steps to copy .dlls to output directories,
so running / debugging no longer requires the PATH to be set
in the .user files.

Reinstalled vs 2010 without SP1.  For some reason had to disable incremental
compiling with this setup.

Removed un-needed dependencies on glu32.lib from projects 1-9.

Changed GLUT includes / libraries to match freeglut.

Fixed float / double mismatches in project 14

Updated README.txt to include prerequisites / configuration instructions