* Variables now match ForgeConfig.cmake
* Add glbinding as an external project passed from ArrayFire
* Fix the config thing

* Remove GLEW and GLU
* Cleanup

* Histogram, Plot and Surface do not work

…entContext
* Before we were calling glbinding from everywhere
* Now its done when window is set to current

cuda_gl_interop.h includes gl.h which requires windows.h to be included before it

* A vector of chart is created for each window
* Each time a chart object (histogram, plot, surface) gets called, the
  appropriate chart is fetch and the object is added to chart
* Window then calls the draw on the chart
* A map of all charts to windows is maintained for lookup