With this PR we refactor `SceneUtil::KeyframeController` not to require `virtual osg::Callback` inheritance. I suppose such `virtual` overhead is not justified here because it negatively impacts many other classes we derive from `osg::Callback`.
* nodecallback.hpp * lightmanager.hpp * lightmanager.cpp * lightmanager.hpp * nodecallback.hpp * nodecallback.hpp * [ci skip] * lightmanager.hpp * nodecallback.hpp * nodecallback.hpp * lightmanager.cpp * lightmanager.cpp * nodecallback.hpp * [ci skip] * [ci skip] * controller.cpp * [ci skip] * osgacontroller.cpp * keyframe.hpp * controller.hpp * keyframe.hpp * [ci skip] * keyframe.hpp * animation.hpp * [ci skip] * weaponanimation.cpp * nodecallback.hpp
