Closes obsproject/obs-studio#4263

Previously the save callback would be called when the replay buffer
hotkey was pressed and not when the saving of the replay was finished.
When the 'get_last_replay' procedure was called after the saved callback
function, it would return the incorrect path, as the path would still
be the previous path.

Just need to forward declare D3D12 type.

Attempt to schedule shared texture copies against the command queue that
the game's swap chain uses to try to reduce artifacts. The heuristics
for obtaining the queue are not perfect, so provide a toggle to use the
previous behavior.

Closes obsproject/obs-studio#4086

This adds the ability to use a secondary black-and-white video as a mask
between source A and B of the transition. The greyscale value of each
pixel is used as the "slider" value in a linear interpolation between the
corresponding pixels in source A and source B.
The track matte can either be in the same file as the stinger itself
(next to the stinger or under the stinger, doubling the width or height
of the stinger depending of the selected layout) or a in a separate
dedicated file.
The same file/separate file behavior is controlled by the
"Matte Layout" option in the stinger settings.

Fixes a bug where the notify object existed after source deletion

Probably long time coming, but when the user changes their default audio
device in Windows sound settings, OBS will now detect it and change the
audio device automatically to the new device if it was set to use the
"Default" device.

This adds additional capture presets, including 3840x2160 and
1920x1080, in addition to the preset "High." These are guarded with
a runtime check using the @Available() keyword for macOS 10.15+.

Right now, linux-capture hard-depends on GLX. Disable it when
running under EGL.

Bug is caused by the internal connection variables not being reset on
reconnect, leading OBS to both be unable to parse valid packets from and
send valid packets to the remote end.  This commit splits RTMP_Init off
into a new RTMP_Reset function, which resets these internal variables
without re-initing the rest of the library.  The original RTMP_Init
calls the new function, perfectly preserving the old behaviour while
adding a new reset function to address the issue with.

Fixes obsproject/obs-studio#2865

While the current code only ever calls try_connect() with the input
argument 'device' in the range of 0 and MAX_DEVICES, this adds a check
to ensure that future code does not break the following sprintf.

In addition, use snprintf instead of sprintf to ensure that if anything
breaks, the sprintf does not lead to memory corruption. Again, the new
check should already make sure of that, but the additional effort of
using snprintf instead of sprintf is so low that it is worth to have a
little more security in the future.

In case no-one else initializes X11 locks do this as part of loading the
module.

Fixes #3479

Add PolyStreamer.com to services.json, and increment the version in
accompanying package.json

Copy patterns from WGC window capture, and BitBlt monitor capture.

Add display capture support via winrt_capture_init_monitor. Almost all
of the existing window capture code is reused.

Rename winrt_capture_init to winrt_capture_init_window for symmetry.

xcompcap was taking locks in the wrong order resulting in deadlocks on
close. If you had an xcompcap properties window open on close it was
nearly 100% deadlock. This ensures locks are taken in the same order as
libobs takes when shutting down.

Add EventLive endpoint and recommended settings to list of RTMP
services. Bump rtmp-services/data/package.json version

Expand PATH for Debian-like systems.
Improve detection when the module is already loaded.

Sets thread names for the hotkey and v4l2 capture threads.

Track all windows corresponding to sources and ensure that we only
disable XSelectInput events once all sources for a given window have
been removed. Previously we may have stopped listening for events if
multiple sources captured the same window and one was removed.

We also move window redirection into the helper to avoid similar issues.

Previously we only captured by window name and class. This prevented
capture of windows with the same name and class, and caused captures to
switch from one window to another of the same name and class.

GLSL does not auto-promote float to vector where HLSL does.

Updates color handling with obsproject/obs-studio#2067