Game is using the Renderer

|SOURCE|
[Common/Game]
* Created an instance of Renderer to draw to the screen
[Common/Renderer]
* Initialise expects a valid SDL_Window pointer and sets the member variable
  for the window
* SetClearColour calls OpenGL's glClearColor function
* Clear will set the appropriate bitfield from the colour, depth, and stencil
  boolean parameters
* SwapBuffers swaps the window's GL context buffers
[Common/PolygonCache]
* Moved the polygon counter code to the top of the function to detect if any
  polygons will be generated, if not the function exits early