Also lets models have a default view for each form. Fixes some incorrect
behaviors with the setup of entities to go along with this (e.g. if there
was no default form, the last form would wind up being the default, rather
than the first, if default views were specified.
Instead of using the built-in camera fitting function,
which wants to rotate the camera, it now calculates the
local bounding box of the object for each camera angle.