This is fundamentally a lock inversion between the parent and child
object variables locks. Interfaces (hotkeys and others) use downward
propagation, so we keep that direction and remove the other direction.

The old video output core assumes that the fullscreen state must be
toggled if the VOUT_FULLSCREEN_CHANGE bit is set. So we need to check
that the target state is not already correct, as the VLC variables core
does NOT do it internally. This commit provides rare exception to the
rule that oldval is useless.

This fixes a whole class of race conditions where two threads try to
change fullscreen status at the same time.

In the video filter case, we now enable fullscreen on all childrens, not
just one. This seems a bit more logical for wall. Without this, toggling
fullscreen would only ever work on the first video output. With this,
things should work great if the different pieces of the wall are on
different video ports, and OK (Alt+Tab is your friend) otherwise.

This reverts commit af688c8f.

The longname argument to macro #define VLC_SD_PROBE_HELPER(name, longname, cat)
is usually in the form like N_("some_longname"). Literalization of the argument by
doing # longname in the macro will result in a literal "N_(\"some_longname\")"
instead of translating the long name.

remove non-existent file reference

typo?

Software versions are totally out-of-date.
Platforms don't even exist anymore.
And this predated ARM support in the contrib.

Use INSTALL.win32 instead.

We already have the variables lock for that.

This fixes a buffer overflow and a warning.
This reverts commit caa08dce.

pl_Hold() assumed the playlist was already created.
pl_Release() does not solve any problem. Playlist synchronization is
done with the playlist lock, while playlist deletion must anyway be done
after all interfaces, services and other threads are joined.