Also fix voice message mark as read when autoplaying after previous.
Also show play icon and don't show playlist for audio files that do
not have shared music files attributes but have audio file mime type.
Regression was introduced in 2fa2fa41c5.
In file download failed handler we suggest to try to load the file
once again to the same location. After some changes we started to
forget filename before failed handler. That resulted in large files
loading to memory instead of hard drive.
Add a precondition in FileLoader to prevent such bugs in the future.
Commit a1b53c660e introduced a regression which caused images that
were shown for sending confirmation as a file path + image not being
passed to FileLoadTask in _image field, they were passed in the
_information field instead. They were not sent in case the file path
was not existing at the moment of processing. If the file path does
not exist anymore read the image from _information and send it.
Server has some extensions checking for inputMediaUploadedPhoto,
so force the extension to be .jpg anyway. It doesn't matter,
because the filename from inputFile is not used anywhere.
Also own PhotoData::UploadingData through std::unique_ptr.
Read media information (image / song / video) in SendFileBox in the
same way it is read in FileLoadTask::process() and reuse it in
FileLoadTask if it was loaded already for the box.
