ENH: add ability to refocus 3d cameras on a fiducial
requested to merge github/fork/naucoin/3683-Add-option-to-focus-camera-in-3D-view-on-position-of-fiducial into master
Added a right click context menu option to refocus the 3D camera to the first selected fiducal. This can help localise the fiducial in a large scene. Added logic method to get all camera nodes and set the focal point on them. Added the call to a self test.
Issue #3683