Play audio and visual effects for all effects in a spell
In the original engine spells play audio and visual effects for all the magic effects within them during the casting animation, and shoot all the projectiles of the magic effects in a spell. Currently OpenMW only does these for the first effect of the spell.
(RM-3519 from redmine: created on 2016-09-02 by R. D., , closed on 2016-09-06 by R. D.)