camera representation in view needs updating with position, fov and gizmos

[rob-bateman]

the current representation of a camera object in the view requires udpating.

Currently, the percieved "direction" of the camera shape faces along the local y axis when it should face along the z axis. The default position of the camera should probably be 0,0,0

There are also no gizmos for manipulating the camera - when selected in the view, both position and rotation gizmos should be made available