Gives the MachServer a unique name which was forgotten in a previous commit

The vod track in advanced output mode would be overwritten by twitch
soundtrack's vod track. Additionally, simple output mode would overwrite
twitch's soundtrack vod track even when vod track was turned off in
settings.

So instead, if vod track is off, don't clear the secondary encoder
unless it's explicitly our encoder. Additionally, make sure that
advanced output mode's vod track encoder behaves consistently with
simple output mode's vod track so it doesn't get overwritten.

Was meant to be "adv" meaning advanced rather than "avc"

Similar to 315fbd6f and 6071098a, ignore non-fatal errors during the
remux process. It's possible OBS itself writes a file that generates
these errors when remuxed.

Previously sliders would not be disabled when the the obs_property was
disabled.

UI: fix typo

This setting, although technically different from the one in the
streaming section of settings, is superseded by that setting.

The setting can still be used via ini file if an actual custom rate
control or keyframe interval is needed.

Also updates references from 2017 to 2019 for consistency.

UI: Use Qt::MiddleButton instead of deprecated Qt::MidButton

- Log CEF version
- Add internal support for CEF 4183
- Add support for CMake 3.19.0
- Add support for fractional scaling in browser panels

This fixes an issue on Windows where loading on a
150% scale display renders OBS windows at 200%.

Reference: https://doc.qt.io/qt-5/qguiapplication.html#setHighDpiScaleFactorRoundingPolicy

CI: Add decklink-captions to dylibbundler fixups

The Scene Collection Importer would attempt to set the new filename
using the name property of the scene collection. However, it would
determine an unused filename, and then replace spaces with underscores,
which could cause a name collision. This changes the importer to replace
spaces with underscores first for the base filename, and then determine
an unused filename.

This commit fixes various issues with screen readers in the main OBS
interface. These were tested using NVDA on Windows 10 2004.

Audio track selection in Settings now says Track 1, 2, etc, rather than
just the number.

Various checkboxes that just say "Enable" now have accessible text that
says what the enable is for (since it says "checkbox", the fact it's an
enable should hopefully be clear).

Type in the recording tab of output now has accessible text which says
"Recording Type".

Items in the Advanced Audio Properties window now have accessible text
for what they are for. Currently some do not report correct values, but
that will require an accessible interface in Qt to be written
specifically for that, which will be done at a later date.

Buttons in the filters window now have accessible text for what they do.

All the right side buttons in hotkeys now have tooltips, and by
extension, accessible text.

This can be useful for reading from textures provided by middleware.

Speeds up loading with large number of filters and prevents deadlock by
not getting the properties of filters during
OBSBasicFilters::UpdateFilters() which uses the source->filter_mutex

This significantly simplifies the
configuration setting's initial load.

This also fixes as issue where the source toolbar
would initialise as "TextLabel" with enabled
buttons if the user had not yet toggled the setting.

Fixes #3722

Certain RTMP status descriptions can contain stream keys. We don't want
to log those normally, so log the description for unhandled status codes
as RTMP_LOGDEBUG. If someone needs to debug an RTMP server's return
messages, they can compile OBS with the RTMP Log Level set to
RTMP_LOGDEBUG.

The Elgato Streamdeck plugin ships their own Qt5Network.dll on Windows,
which may be ABI incompatible with newer Qt DLLs if we decide to update
our Qt version. So to prevent that plugins (and other plugins) from
using their Qt5Network.dll, we need to explicitly load our
Qt5Network.dll first so that we can prevent it from trying to load
theirs beforehand.

For context on this, previously, we didn't ship Qt5Network on Windows
because we would have to ship OpenSSL with it, but we didn't want to
ship it without SSL support. Because of that, Elgato's Streamdeck plugin
would ship their own Qt5Network.dll library (that didn't have SSL
support anyway). However, Qt recently added support for windows
schannel, which allows SSL support via the Windows API, making it so we
don't have to ship extra libraries to get SSL. So now we can start
shipping Qt5Network without worry.

4f873376 as part of PR #3460 changed ffmpeg_mux_packet to
fail = !ffmpeg_mux_packet. ffe4c855 only reverted that one line
instead of the entire previous commit. When the change was
reintroduced in 6071098a as part of PR #3740, it became
fail = ffmpeg_mux_packet without the negation.

This commit reverts db1e6aa1 and fixes the logic check.

This reverts commit 6071098a.

Removes the animated test card that was generated from code but is no longer in use

Include pthread_np.h header and use pthread_set_name_np to fix build
on FreeBSD 12.1.  The Linux-compatible pthread_setname_np alias was
added later.