UI: Use standard resolutions with auto-config

Implement CUBE LUT domain properly, tetrahedral interpolation for 3D LUTs

UI: Don't clip meters when resizing with no input

Show accurate path in Crash dialog

Closes obsproject/obs-studio#2290

obs-ffmpeg: Fix srt output

Redirect non rtmp streaming to ffmpeg-mux instead of previous
ffmpeg-encoded-output which has been removed.

This replaces the ffmpeg-encoded-output which had serious issues
(missing headers, muxing issues with non compliant mpegts streams) with
an output grafted from obs-ffmpeg-mux.

Moves the code that generates a file read error message to its own
function for the sake of cleaning things up a bit.

UI: Hide script tabs if no python settings

UI: Remove language region

win-capture: Reset WGC fail flag for new window

libobs: Return target instead of current in calc_torquef

If the previously calculated torque value is too close to 1.0
(but not considered 1.0), it would be impossible for the TBar to
finish its transition since it returned the old value, causing desync.

WGC will give up on a window that it fails to capture, but that
shouldn't stop it from attempting to capture new windows.

Fixes #2928.

Fixes a bug where if the theme was changed, then wasn't saved, and the
user exits the window with the [x] button, then chooses "No" when asked
to save settings, it would not restore the original theme.

libobs: Remove log entry for CoInitializeEx pass

Remove entry from the top of the log. Always returns S_FALSE, and that's
unlikely to change.

libobs/util: Fix POSIX event bugs

libobs: Fix da_reserve early return logic

mac-capture: Use resize instead of reserve

Handle spurious wakeups, and ensure mutex unlock.

Test desired capacity against original capacity instead of size.

Better practice for the tracked size to be nonzero.

This does NOT speed up window capture significantly.

plugins: Add oss-audio input support

obs-ffmpeg: Fix AVFrame handling in FFmpeg output

CI: Update Github Actions with caching and macOS improvements

libobs-winrt: win-capture: Detect GraphicsCaptureItem closure

Make WGC window capture recover from GraphicsCaptureItem closure, which
can occur when following links in fullscreen Chrome for example.

Fix an issue in the way AVFrames were handled in the FFmpeg
encoder plugin, which could lead to tearing in the encoded
video due to data races in the AVFrame and AVBuffer.

This is fixed by calling av_frame_make_writable which ensures
the frame and its associated buffer are writable. If its not,
it will copy the AVFrame, create a new AVBuffer for it and
decrease the refcount of the old AVFrame and AVBuffer.
This way OBS always ends up with a usable buffer to write into
which is not still used by the encoder while avoiding a copy
when unnecessary.

A long standing lack of synchronization on the elevated process handle
made the non-elevated process always exit, so the updater would assume
it was started elevated and launch OBS from the elevated context.

Also applies the altered working directory to the non-elevated code
path so it can find the OBS executable properly.

libobs: Don't allow duplicating scene sources

deps/glad: Fix build with GCC-10

GCC-10 defaults to '-fno-common' [1], which triggers issues with
defining global variables multiple times.  To fix the build, use
'extern' to turn the first definition of 'gladGetProcAddressPtr'
into a declaration.

1. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678

Closes https://github.com/obsproject/obs-studio/issues/2828