Added two new methods to orient the camera.
The first method changes the camera's position.
The second method changes the camera's orientation (that is, where it's
looking).

Signed-off-by: Jordan Deyton <deytonjh@ornl.gov>
Fixed a bug with the last commit. Since we use a separate vector to
store the "up" direction while mouse dragging to "look around", that
needed to be set as well when calling via the public setOrientation
method.

Signed-off-by: Jordan Deyton <deytonjh@ornl.gov>
Set the default initial camera orientation for the plant view to look
down the x axis, with z up and y left. This is the desired perspective
since most of our users view a plant laid out on the yz-plane.

Signed-off-by: Jordan Deyton <deytonjh@ornl.gov>