Arnold cameras in Hydra

Arnold Cameras in Hydra: Arnold cameras (vr, cylindrical, spherical, uv, fisheye) are now supported in Hydra. You create the Arnold cameras as USD built-in cameras, with a string primvar arnold:camera that specifies the Arnold camera type. (usd#1738 usd#2082)

Arnold camera types now supported in the Houdini Solaris Camera LOP (HTOA-1749)