[WIP] Improve encapsulation by passing in IEmulator when calling Bk2Movie functions
          #4491
        
          
      
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Removes all uses of
Bk2Movie.Emulatorexcept the assignment inAttach, a reference equality comparison (inDebug.Assert, for catching regressions), and a read ofbase.Emulator.FrameinTasMovie.Item[]which I left as a TODO.Should the
MovieSessionhold a reference to the core instance? I've added a prop, set at the same timeAttachwas called, but maybe it should be passed in to all those calls too.