Overlay Registry Improvement

group overlays and position in group
so we can build a overlay collection and set positions for the different entrys in one group
that green eye on the group is to show/hide borders for the elements

also add media-gallery as source for that with an element where you have to select which media type is it and if its a audio or video file toogle for loop and autoplay because OBS-Browsersource dont have an modifier for that