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
Temporarily disabled logic for forward render of probes to avoid data mangle. TODO: fix up forward once deferred math is locked in
Split probe modes out into distinct environmental probe objects
Removed the probes from tracking their own baked cubemap file paths and instead have a pref store it
Removed old probe shaders and materials that aren't used now.
Fixed mLastConst memory leak by removing nono line.
