OO-2985: scroll to the warning message if someone want to delete its work in the drawing interaction

OO-2732 beautify d&d question type, use color coding and border styles to distinguish between source and target

OO-2784 optimize sections, add item id (hidden), compile offline files for download, beautify coach comment

OO-2790: implement persistence of panel open/close for QTI 2.1 and comment, disclaimer, results and asssessment documents

OO-2742: reimplement start option (without autoplay), host in openolat flv.js and hls.js to prevent url with http/https blocked by Firefox, enhance useability of chapter editor

OO-2732: implement a matchInteraction with drag and drop (fallback to click possible) with slightly enhanced editor and word export

OO-2756: add check to show only once the user name in the  small user view if the admin configured it wrong, fix css class

OO-2756	: add progress bar and percent value for score, add section summary for the questions correct, answered, and not answered

OO-2765: fix some issues with the qti plugin, hottext, gap related to copy / paste of the html content of the editor