GRIM: Move back the call to set the head lookat after animating the model.

That broke Glottis when he sings the tusty anchor.
(cherry picked from commit 1d46a8190cf932c2fabfac816e89788b37389dea)
GRIM: Fix volumes setting. Fix #710
(cherry picked from commit 90247d08265c8d35225449d434ac91775970f0ee)
GRIM: Set ModelNode::_initialized to true on node loading.
(cherry picked from commit c31551c6f33a34052007ce6fe60603d36aac6e48)