fix(SettingsWindow): rename icon property of TabButton to iconName (issue with Qt 5.10 and new icon property)

fix(Call): saved videos/images/sounds avoid usage of `:` separator in filename (unsupported on windows) (close #115)

chore(submodules): update ffmpeg, fix build on windows (external error with bad macros expansion!) =>
close #113, close #110, close #109, close #97, close #90 and close #59