camerasplines in general previously assumed you would always want to ease in and out at the first and final node. even when looping. adds an mUsease to it, and to pathshapedata to optionally shut that off. (on by default to behave as legacy)
SceneObject now defaults to a category of "misc"
getCategoryOfClass now checks parent classes for what categories they hold so that variants can inherit
categories are in one of a few rough groups and subgroups depending on actual mapper needs/usages
