Feedback master -> Layer master

Hi!
I guess that name - Feedback master - is not correct cause you can use it to style any layer not only quiz feedback. I use it to style popups. So I would rename it to Layer master (that is much more obvious).

One more issue I found. 
Feedback master is presented like SLIDE. But it should be LAYER. Cause you can't apply feedback master to slide (to layer only). So if I have a button on feedback master with trigger to HIDE THIS LAYER - it will not work.

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