(This commit also modifies deps/libcaption)

Closes obsproject/obs-studio#1354

Fix GCC 9 Warnings

vlc-video: Dlopen libvlccore.dylib on mac OS

rtmp-services: Adding Castr.io ingests to service list

As of version 3, libvlc on macOS is linked against libvlccore
differently. Previously libvlccore was referred to via the @loader_path
macro, now @rpath is used. As such, dlopen is no longer able to find
libvlccore. Explicitly load libvlccore so that the symbols that
libvlc needs can be found.

Tested against VLC versions 2.2.8 and 3.0.3.

This function returns a char *, so it should not be const (the value is
set from a function which also returns a char *, so there is no real
reason for this to be const).

Removes a likely unintentional self-comparison.

As declared, transform_val is static inline, but it should be marked as
a static inline void since it does not return.

The loop increments i towards an unsigned type, so i should also be an
unsigned type.

UI: Add frontend event for when OBS finishes loading

This reverts commit 958167c4.

This caused certain transcoders (specifically Twitch's transcoders) to
misinterpret the data and transcode the video incorrectly.

Technically, setting the transparency value via a color property isn't
currently supported.  However, some sources/filters will set their alpha
portion of their color value to 0, which would cause the color property
to have a transparent background.  Set the alpha value to 255 for now,
at least until we properly implement support for setting transparency
via the color property (if we ever do).

With the recent change to fix showing color in the color property widget
when using different themes (b8f03791), a bug was introduced:  when
opening filters with a filter that has a color property, it would sort
of "bug out" and recreate over and over.  This is likely due to
something internally with Qt and the stacked layout.  The stacked layout
really is not necessary, so remove the stacked layout and just use the
color label directly.

UI: If group's name exist, start it from 2

libobs: prevent crash from unbounded copy and bfree

Restricts the range of the copy to count number of characters.
Changes function to strip wrapping quotes as intended.

libobs: add obs_source_frame_copy

libobs: Fix Monitoring devices showing input devices

Use selected color in color property label

Fix several mem leaks

libobs, UI: reset hotkey description on target rename

Currently if you making a new group it named "Group 1" by default
instead of just "Group". This fixes it. The second group will be
named "Group 2".

UI: Fix mixer dock widget minSize being too big

When the vertical volume meter was introduced it set in the OBSBasic.ui
mixer dock definition a min width/height that was valid for both
widgets. QStackedWidget hints the minimum size as the higher w/h
of its children so this workaround is necessary.

If the transition point was above or equal to 1.0, it would cause a
divide by 0 error a few lines down.  This could cause audio data to
become corrupted with NAN audio data when mixing, which can cause
certain audio encoders (namely the FFmpeg AAC encoder) to fail.

It was possible for the transition point to be above or equal to 1.0 if
the stinger media file was no longer loadable for whatever reason.

When using a macOS running on a case-sensitive filesystem, the project
build fails due to AudioToolBox/AudioQueue.h not being found.
The correct path is AudioToolbox/AudioQueue.h. Since macOS comes with a
case-insensitive filesystem by default, this is a rare ocurrence
among developers who change it to be case-sensitive.

This little change skips returning true immediately when a call to
CoreAudio fails. Instead, it uses similar behavior as further 3 calls
below this change, just checking for unfreed pointers before also
returning true.

This bug fix is to show output devices in the Advanced Audio
Settings configuration, where currently on macOS it shows erroneously
input devices.

obs-x264: Specify x264 color space for BT.601

Back in an older commit, the default YUV colorspace was changed to 601
in order to ensure correct playback in video players that ignore the
contents of the H264 header.
x264's "undef" is unfortunately not what players that don't ignore the
header expect for BT.601, resulting in incorrect colors when played
back. Setting it to "bt470bg", similar to what is specified in ffmpeg
outputs, remedies this issue.

obs-ffmpeg: Set average framerate in video stream

A leak was introduced by commit 1682d77d (July 11 2015).
This is a fix.