Working on the youtube api. Also uncommented lines in the css files that were preventing the pictures from zooming in
Added a bunch of edits. Fixed the tiny puzzle pieces, re-added image zoom functionality, re-added loadingslide, added youtube preloading and tests, cleaned up YouTubeSlideGenerator code and added events+error-handling, and tried to make TTSService a little less wasteful
Added preloading to the youtube slides and edited the finalizedtopicslide to wait on it. Still need to force YTSlide to accomodate more players, though (currently only one shared player reference for all videos)