Make image data public for now

this is just for easy access, later make a proper interface for image data
generalise makefile

this may be too generic, will see later if it becomes a problem
Basic ray with crude sphere intersection
Basic camera to get rays, orthographic for now
draw a circle, YAY
Add a tad of perspective

it just floors the intersection value, very crude but it shows that
there is shape to the sphere the not just a circle