If we want to pin a chat and we have reached the limit we now check
for a deactivated (converted to supergroup) chat that is pinned and
is not in the chats list and just silently unpin it if it is found.
Also possible UB fix for a waveform encoding and decoding.
Media::Player::Instance started to notify about all sound
playback updates, even for video files (which do not have
DocumentData filled in), while Media::Player widgets were
relying on the existance of DocumentData in each update.
John Preston