Various fixes for discrete rotation
Various fixes for discrete rotation

- swapped x and y axes so they do what they say they do
- aligned circles with the camera to make them look like they're all intersecting, as well as containing the rotation guide for arcball
- fixed issues with atan changing signs and z rotation

3DUI/testing-rotation-controllers,3DUI/testing-rotation-controllers,3DUI/testing-rotation-controllers,3DUI/testing-rotation-controllers