*.dir is an MSVC thing
CMake rejigging, distutils extension building

* Add OpenGL to the dependencies
* Add FLTK to the dependencies (Commented out - not used currently)
* Use the REQUIRED keyword instead of FATAL_ERROR
* Introduce DistUtils into the build sequence and a currently empty
plugin for use later
* Removed dummy comment from main
* MakeProgramZip should just take the directory and create a PyDoom.zip
there