Interactive whiteboard application

Version 1.7.3$$$Bug fixes$$$Tried to mitigate some audio related issues on Debian; by forcing the use of the ffmpeg backend (see Known Issues for more details on the remaining bugs)$$$fixed an issue where the Windows package would not contain the good version of openssl dlls$$$Known issues$$$On any widget; select options (Drop-down lists) wont appear at the right position. Be careful as it sometimes will appear behind the left or right palette of the Board Mode.$$$Reading multiple audio files; then; within the same session; coming back to a previously played audio file end in the audio file not being played correctly; especially with short audios. Duplicate the audio to replay it without any issue; or use any other way to play audio (desktop mode; letters order interactivity; online audio and video apps like peertube; etc).$$$Some use cases remain where you can end up with documents at the same level having the same name.$$$An issue can occur; that is not clearly identified at this time; when importing an UBX; where users end up with the imported documents appearing multiple times in the documents tree; at the same level.