Found out that CrosseyedWebGLRenderer probably wouldn't work for target-less cameras.
Something weird going on with `webgl_scene_test.html` and `webgl_scene_test_blender.html`. For some reason cubes dissapear.
Just a single callback is now passed to loader.load( "scene.js", callbackFinal ) - callback which is called when everything from the scene was already loaded.
If you want to use also callbacks for initialization of procedural synchronously created elements, you can set property of loader:
loader.callbackSync = function( result ) { ... }
If you want to get callback for load progress, set:
loader.callbackProgress = function( progress, result ) { ... }
Also added per scene creation of collision systems (it used to be singleton).
Work-in-progress.
So close yet so far. Test scene almost works, just two things are not rotated properly (which means maybe everything will need to be reworked :(