(This commit also modifies UI)

Closes jp9000/obs-studio#1204

UI: Don't draw bounding boxes for sources without video flag

If a config file value is set to a blank value, the value would not be
set and the default value would be used.  This fixes a bug where the
user would try to remove the replay buffer prefix, only to have the
prefix be added again next time they start the program.

FFmpeg has recently made their "fast" AAC encoder the default, which
uses less CPU and sounds better at common bitrates.

The cutoff hack was added many, many years ago as recommended by
Konverter.  Since then, there has been much work on the AAC encoder, so
this hack should no longer be necessary.

The windows media foundation H264 encoders have been deprecated for over
a year, and microsoft's media foundation AAC encoder has had a continued
issue with occasional random audio glitches.  The FFmpeg AAC encoder has
had recent development, and is more than sufficient to be able to handle
the task of encoding in terms of both quality and performance, so it's
better just to use the FFmpeg encoder from here on out.

As this plugin is no longer needed, for the next year or two it'll still
be compiled and included, but as a blank plugin that does nothing.  The
reason why it's still being included as a blank no-operation plugin is
to overwrite older versions of the plugin.  That way if a user installs
a newer OBS version over an older one, it won't load up the older win-mf
plugin where the encoders still were enabled.

This also fixes some rarely reported media foundation crashes that can
happen on startup.

Fixes an issue where align_pos could be smaller than
sizeof(struct shmem_data), potentially overwriting memory of the header.

References jp9000/obs-studio#1202

This version change is specific for the mac version -- it's mostly just
to update the Qt package.

Closes jp9000/obs-studio#1196

Closes jp9000/obs-studio#1188

Caches the frequency of the performance counter.  It was supposed to be
caching it already, but it seems that code was unintentionally not
included.

Closes jp9000/obs-studio#1185

This commit adds SermonAudio RTMP ingest to services.json

Closes jp9000/obs-studio#1190

Closes jp9000/obs-studio#1197

(Note: This commit also modifies the deps/media-playback module.)

Allows modifying the speed of local file playback.

Closes jp9000/obs-studio#1091

Instead of using countless parameters for the media initialization data,
use a structure.

This code was originally tested with visual C, which supports using
__FUNCTION__ in this way.  These potential error cases shouldn't
technically happen anyway, so just remove __FUNCTION__.

OBS assumes the name of the imported json file is also the name
of the scene collection, if the filename is different this can result
in duplicate scene collections after importing.

Closes jp9000/obs-studio#1177

UI: Add deps to fix vst UI

CI: Include style plugins when packaging on OSX

(This commit also modifies the obs-ffmpeg module)

The default channel layouts from aac spec are implemented in FFmpeg
native aac encoder as follows:

    AV_CH_LAYOUT_MONO,
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_SURROUND,
    AV_CH_LAYOUT_4POINT0,
    AV_CH_LAYOUT_5POINT0_BACK,
    AV_CH_LAYOUT_5POINT1_BACK,
    AV_CH_LAYOUT_7POINT1,

The correspondence of speaker layouts to AV_CH_LAYOUT from FFmpeg is
changed to reflect the previous table.

Although FFmpeg native aac encoder can now encode all the layouts listed
in avutil channel_layout.h (on master), there might be issues with older
FFmpeg binaries.

Note that 2.1 speaker layout will be encoded as AV_CH_LAYOUT_SURROUND
(FL FR FC) because it is not listed as the default layout for three
channels.

This just means some optimizations for LFE channel will not be used by
the encoder which will treat it as an SCE (single channel element).

Closes jp9000/obs-studio#1182

cmake: Fix LuaJIT search

UI: Fix grayed out Copy option in sources context menu

Fixes a bug where the thread local variable "current_lua_script" is not
set when calling script_tick.

(This commit also modifies the frontend-tools module)

Prevents a potential crash when script_log is called by a thread spawned
by a python library.

This fixes a problem introduced in #1050 where the Copy option would
be grayed out when rightclicking a source above the currently selected
source. This also retains the functionality of not having the Copy option
enabled when no source is selected.

CI: Fixes to get OSX packaging working on travis

CI: Fetch RVM gpg key on osx