Closes obsproject/obs-studio#3005

UI: Auto update projector settings

win-capture: Improve Vulkan synchronization

UI: Delete existing fullscreen projector

libobs: Remove excessive null checks

libobs-winrt: Move project to core VS filter

win-capture: Remove dead VkResult values

libobs/media-io: Remove unused code

libobs: Use autoreleasepool for graphics thread

Media playback fixes

rtmp-services: add angelthump

Prevents it from writing to non-existent vulkan registry locations on
32bit-only systems.

Allocating a vector for the hundreds of small files and only reading
64k at a time was a bottleneck on systems that were not I/O bound.

If the elevated user was a different user account, the updater would
look in the wrong user's appdata for the manifest and fail.

In rare cases, "runas" would somehow launch the updater as a non-admin user
again, resulting in a loop where the updater constantly spawns processes.
Fixes https://github.com/obsproject/obs-studio/issues/2984

UI: Update NSIS installer script

This would cause meaningless "Service '' not found" log entries.

If replay buffer hotkey isn't set, this would cause an error to be
logged due to a null string.

cmake: Update Windows SDK check to 19041

There is no resize happening in this code, so bilinear doesn't make
sense. Fixes artifacts caused by SWS_FAST_BILINEAR approximation.

swscale with SWS_FAST_BILINEAR produces artifacts.

Apparently necessary to clean up macOS leaks.

This brings the script in the repo up to date with what is being
used to generate release builds for OBS Studio on Windows, as
well as fixing up a few issues.

libobs-winrt: Require Windows 10 SDK 19041

This will prevent compiling without WGC cursor toggle support.

rtmp-services: Add Mixcloud service

If an image source isn't visible there is no point polling for changes
during the time it's hidden as no one will see them. Should the image
be on unreachable media such as an unavailable network share, this
check would cause the graphics thread to periodically stall trying to
detect changes of a non-visible image source.

If the image is modified while it's hidden, the updated file will now
be loaded as soon as the source is made visible - the update timer
intentionally ticks up while hidden.

Partially fixes some of the behavior described in
https://github.com/obsproject/obs-studio/issues/3007, a full fix
likely requires significant changes to support OS-specific file change
notification APIs.

This reverts commit 636f0bfd, reversing
changes made to b9ea45e4.

obs-qsv11: Simplify QSV settings in UI and Enable AVC VDEnc on ICL+ 

libobs: Fix os_get_executable_path_ptr on Linux

Modules are now unloaded while OBS core is still active, allowing
modules that call into libobs in their unload function to continue to
work. This changes the behavior of such calls - previously they were a
no-op since the OBS core would be gone, but they are now executed with
the OBS core still being active.

libobs functions check for a null obs_core inconsistently. If the core
is null, the functions silently return with no indication of an error to
the API user. This commit removes all null checks in libobs functions
that require libobs to be initialized. For OBS Studio, we are
(hopefully!) using the API properly so this should have no impact.

libobs: Use correct data pointer for hotkey pair