UI: Make Dark theme group box title bold

CI: Run clang format on linux and osx CI and fail if changes are made

Apply clang-format to objective c code

Add the ability to pause and unpause recordings

Cleans up obs-ffmpeg.c and separates all the logging code to a different
file, which can be enabled with ENABLE_FFMPEG_LOGGING.

Closes obsproject/obs-studio#1957

Adds support for pausing recordings.  When settings are eligible for
recordings, a pause button will appear next to the recording button.  If
the settings are not eligible, it will warn the user in the output
settings that they cannot pause recordings if those settings are used.

This implements pausing of outputs.  To accomplish this, raw audio/video
data is halted to the encoders or raw output.  Pausing is as precisely
timed as possible according to the timing of the obs_output_pause call,
and audio data will be spliced down to the exact audio sample in
accordance to that timing at the start/end marks.

Outputs that support this (outputs used for recording) can set the
OBS_OUTPUT_CAN_PAUSE capability flag.

This terrible boilerplate code is no longer necessary, as it is now
fixed by the previous commit.

If the audio subsystem was buffered to any extent, the audio of a raw
output would start off at a negative offset, requiring each raw output
to implement a "prepare_audio" function (as seen in the FFmpeg output)
in order to ensure proper synchronization with video.  This did not
apply to encoded outputs because it was already being performed by the
obs-encoder code.

Returns the current video frame interval between frames, in nanoseconds.

The replay buffer was triggering on both button press and button
release, which is redundant.

Allows the ability to pause when streaming and recording use the same
tracks in advanced output mode.

rtmp-services: Update and prune services

.git-blame-ignore-revs: Add file to handle mass reformatting

libobs: Fix format selection

libobs-d3d11: Unnecessary type conversions

Fix ternary test to use BGRX render targets for YUV to RGB
conversions. The previous behavior may have been fine though since
the shaders fill the alpha channel with 1.0 anyway.

Use raw pointer on both sides of ternary test result to remove
conversions.

Google's git-hyper-blame command is a variant of git-blame,
but it can ignore certain commits like mass reformatting in f53df7da .
To use git-hyper-blame, it is better to make a .git-blame-ignore-revs file
in the repository root directory and put commits in the file to ignore such
commits.

Ref: https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/git-hyper-blame.html
https://chromium.googlesource.com/chromium/src.git/+/437b870/.git-blame-ignore-revs
https://github.com/mozilla/gecko-dev/commits/03c48ac/.git-blame-ignore-revs

rtmp-services: Update ingest list for Restream.io

libobs-opengl: Empty VAO

Use an empty VAO for shaders that generate their own vertices.

Apply clang-format to the project

Prevents automatic formatting with clang-format

Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed.  Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.