OO-2896: implement a plugin for tinymce to count the number of characters of its content (inclusive HTML markup) and enable it for the info messages editor and the forum

OO-2939 remove unnecessary width and height on movie element, remove legacy responsive css for mediaelement

OO-2871: allow the hotspot interaction to be responsive on small screen, allow the author to resize the background images

OO-2868 improve copy/paste links by wrapping them in an input field for proper selection without trailing whitespace

OO-2488: enhance the rich text editor to have 3 levels of representation: one line, multi-line and formatted, set the one line option for the single and multiple choices answers in the editor for QTI 2.1

OO-2895 add css class to all file elements and hide error icon that clashes with file element chooser

OO-2803: separate the video from the table, remove the list in editor which duplicate the data model, rewrite the validation of chapter, drive the video per javascript command and not per reload of the video...

OO-2636: enhance search in coaching tool with different views if a single user is found or multiple, implement excel export with 2 sheets

OO-2830 fix several bugs in members display code, bring back configurable user properties context, also for avatar view

OO-2636: better support of cancellation of lecture block , add toggle switch to see own blocks or all