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
dragforce for rigidshapes and children defaulted to a value it's own debuggers won't complain about out of the gate
removed duplicate invalidation for flying vehicle sounds causing network instability
removed redundant hovervehicle vars