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.
Before historyPeer and historyPeerCanWrite were independent, so we
created a new Info section for both of them changing.
Now we use Data::CanWriteValue(peer) and rpl::flatten_latest().
Regression was introduced in df64c97.
New base::flags work correctly only if all mutually exclusive flag
values use mutually exclusive bits (a & b == 0 for exclusive (a, b)).
Closes#3856.
Also don't change mask corner images when color theme is changed.
This prevents race condition in mask corner images access, because
the GIF frame readers access mask corner images from other threads.
Media::Player::Widget displays the current voice / video message
if it is played and the current song otherwise.
It is created when a voice / video message starts and is destroyed
when all the voice / video messages in the playlist are finished.
Use AudioMsgId instead of videoPlayId.
Any audio track now can be a child loader track of some video clip.
Use Type::Voice instead of Type::Video for round video messages.
Video messages play / pause / resume the same way as voice messages.
GIFs get paused if some other layer is displayed above.
Media preview > Box or layer > Saved GIFs panel > Inline bot results.
If any of those is displayed, GIFs inside message history pause too.
Currently the build without implicitly included precompiled header
is not supported anyway (because Qt MOC source files do not include
stdafx.h, they include plain headers).
So when we decide to support building without implicitly included
precompiled headers we'll have to fix all the headers anyway.
Some major platform-dependent file operations refactoring.
All methods like "open file", "open file with", "show in folder"
were moved to core/file_utilities module with platform-dependent
backends. All methods interacting with DesktopServices made async.
