Deferred load is used specifically for macOS systems to ensure that Qt
and CEF do not load at the same time.  This causes a slight bit of a
delay in loading the scene after the UI has loaded.  This is not
necessary for other operating systems, so revert to the older load code
in the case of different systems.

Fixes a bug where it would try to save the scene before the scene had
been loaded on macOS.

Prevents a potential crash when being used with audio data that is
unaligned.

Fixes linux-specific compiler error:
libobs/libobs.so.0: undefined reference to `hmax_ps'

Add a new algorithm to calculate the true-peak. It implements the
Whittaker- Shannon interpolation from four samples to create 4
intermediate samples (5 x oversampling) inbetween the middle two
samples.

With 4 samples and 4 intermediate samples the algorithm can be
implemented as a 4x4 vector-matrix cross product, which is ideal for
SSE.

I've also replaced the sample-peak algorithm using SSE as well to
improve performance.

Closes obsproject/obs-studio#1189

win-capture: Avoid obs functions in init_hooks

UI: Fix no_space file naming for replays

rtmp-services: Update ingest list for Restream.io

Replays was ignoring user's settings when generating replays filenames.

Separate crash handler from libobs startup

Closes obsproject/obs-studio#1266

obs-ffmpeg: fill in more fields on audio frames

Closes obsproject/obs-studio#1263

Adds obs_add_raw_video_callback() and obs_remove_raw_video_callback()
functions which allow the ability to get raw video frames without
necessarily needing to create an output.

Reduces GPU usage when encoding is not active.  Does not perform color
conversion, frame staging, or frame downloading unless encoding is
explicitly active.

This should ease the support task to help with performance and
xcomposite issues on such systems.

Closes obsproject/obs-studio#1194

UI: Disable paste filters unless a source is selected

Fixes the paste filters right click option to behave like copy.

See: https://obsproject.com/mantis/view.php?id=1220
and #1261

libobs: Fix pasting filters crash when missing sources

Closes obsproject/obs-studio#1270

Closes obsproject/obs-studio#1259

UI: Change monitoring device on profile change

Prevents Alt-Enter from attempting to automatically fullscreen an OBS
graphics display.

Closes obsproject/obs-studio#1248

obs-outputs/flv: Fix ECMA array size

Audio controls in OBS Mixer and Advanced Audio Properties window are not
sorted at all.  Every time OBS is restarted they get shuffled (Jim note:
This is due to json object hashing).  The order of these controls is
additionally not consistent between the mixer and the advanced audio
properties window.

Closes obsproject/obs-studio#1242

Allows the ability to get the last rendered texture of the main output
view.

[Qt 5.11] Include 'QAction' in 'scripts.cpp' to fix a build failure.

The filters array should not be accessed without locking the filter
mutex.  This locks the filter mutex, grabs a reference to the first
filter, unlocks the mutex, renders the filter, and then releases the
reference.

Closes obsproject/obs-studio#1215

Vth264 fixes

The "Delete" shortcut is already set in the UI/forms so the old code
would only change shortcuts in macOS.

Closes obsproject/obs-studio#1212

On windows, the "Always on top" state can safely be used without closing
dialogs.

Closes obsproject/obs-studio#1207

Holds the clipping flash for one second to better indicate that clipping
is occurring.

Closes obsproject/obs-studio#1201

Add Selected and Hidden Array Values

Let developers get and set whether items in an editable list are hidden
or selected. May be useful in when editable lists are modified and
handled in a callback. Especially when edit button callbacks are used.

Closes obsproject/obs-studio#1200

Due to the commit 34c14829, source loading is now deferred
to after OBSInit(), which would cause saved scene/source projectors to
no longer load on startup.  This fixes that issue by moving the
OpenSavedProjectors call to OBSBasic::Load().