Re-evaluate the values and range of near and far clipping planes of Camera

This is a follow-up issue of RT-29982 which I didn't realize was restricted to the fixedEye for some reason. I think the clip planes make much worse problems in the default eye position. If you create a usual-sized scene and assign a default perspective camera to it, the eye will be placed around and behind Z=-1000. So anything on the zero plane will be far behind the far clip plane. This can even be considered a serious regression, because if the clipping worked in rendering, I think Ensemble wouldn't show anything (the various 3D demos likewise). Also, take any 2D app, use a perspective camera, and most likely all the content will be out of clip planes. I guess the only reason this has not yet come up as a critical issue is that the near/far clipping doesn't work.