OO-2935: remove unused link top for the full text search results, fix NPE if the context entry is null (it's the case if the user search for the name of the course element)

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-2924: delete the three specialized course log exporter, remove the explanation in the spring file

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