A function that merges "play" and "stop" together
Takes a boolean parameter, where if true, the animation will play, and when false, the animation will stop
  overload 1:
                        
Animation:setPlaying()  
  | Method Property |  Fluent Description |  Representation | 
 | Return Value |  an Animation |     |    
 
        overload 2:
                        
Animation:setPlaying(bool)  
  | Method Property |  Fluent Description |  Representation | 
 | bool accepts |  a Boolean |     |    
| Return Value |  an Animation |     |