orthographic camera in 3D mode

## Use Case

sometimes it is useful to have a orthographic camera in 3d mode.
This could help for max projections. 
## Solution

Add a perspective vs ortho camera toggle. Add "align camera to axis" buttons to have quick ways to view along x,y,or z axes.   This conflicts with XY , YZ, XZ modes which are "single slice" modes. So we have to resolve the ux for that.

