OpenGL Ellipsoids
This PR implements various ellipsoids.
Notes:
- For the exact functionality see the updated documentation
- The draw circle subroutines are a lot more efficient than the draw ellipsoid subroutines. Therefore the draw circle subroutines should be used if possible.
This PR adds the following public subroutines:
fillCircle
drawCircle
fillLinedCircle
fillEllipsoid
drawEllipsoid
fillLinedEllipsoid
fixes #32 (closed) fixes #33 (closed) fixes #34 (closed)