Add QT proprietary 5.15.14, 5.15.19, 6.8.1, 6.8.3 in Dockerfile.
Modified CI and dockerfile to use qtchooser, to keep the same behaviour without having to rely on a specific entrypoint.
Split opensource versions from proprietary versions by using a different directory.
try to remove ffmpeg dependency #LINQT-2015
Clean friends manager maps when restarting app as the linphone core will be reset (fix #LINQT-1933)
only show error message once when linphone restarts if remote configuration failed #LINQT-2030
auto update contact list on carddav synchronized (fix #LINQT-1983)
