Improve "This Slide" functionality

Currently This Slide is used as a nickname for the current slide. It's positioned within the chronological slide list instead of at the top with Next Slide and Previous Slide. This has a couple negative impacts:

• we need to scan through a potentially complicated list to be able to locate it.
• if we are copying a trigger from another slide, we need to reprogram it on arrival.

Please consider making This Slide into a constant like Next Slide and Previous Slide. In addition to improving the situations above, it would also give us the ability to use it on the Master Slide. 

examples on the Master:

Possible: When the timeline starts on This Slide, execute javascript.

Not Possible: When the user clicks Try Again button,  jump to slide This Slide.