Load initial particle system state from NIF files
NiAutoNormalParticlesData contains information about the initial state of the particle system. This should be used to create particles on load. When this is implemented the call to fastForward can be removed.
(RM-2178 from redmine: created on 2014-12-02 by scrawl ., , closed on 2014-12-06 by scrawl .)