Task: Tasks don't support embedded media and linked files on OpenOLAT - remove respective functions from Tiny

In the new Task course element, tasks can be created as html file with the TinyMCE Editor. When adding media to the file, or links to files on OpenOLAT e.g. in the library, it works while being in the editor, but not in the runtime. Due to security reasons, html files are always downloaded. But only as single file, and not as .zip with the accompanying embedded files. Links to files (other than the specific external links) won't work either once downloaded.

Most tasks created in such a way will therefore be useless. This should be rectified in two steps:

1)10.3.8 remove the functions insert/edit video, insert /edit media element, insert / edit image, insert / edit link : this issue
2) 10.4 make it work somehow : another issue