[0.915][bug] Multiple target spell bugs

1. Many people have reported loss of action bar during tactical combat.  I've noticed that this occurs every time a hero (player or AI) casts a multi-target spell, e.g. mass curse, if the next unit on initiate is a hero then they will lose their action bar.

2. Units with magic resistance to single target spells are not resistant to multi-target spells e.g. resistant to curse but not mass curse.

I do hope we get a bug fix patch before the next beta.