rtmp-services: Add Eventials streaming platform

This adds the ability for users to change the names of audio sources
from the mixer including desktop and mic/aux sources.

Closes jp9000/obs-studio#1055

When device timing is used, it shouldn't be modifying the timestamp.
Fixes an issue where certain devices with large audio segments would
seem a bit out of sync.

UI: Add Frontend API function to save replay buffer

UI: Disable source copy if no sources are selected

In the FFmpeg output, it was not passing the muxer settings to the
AVIOContext, so some settings would not be properly passed to protocols.

Closes jp9000/obs-studio#1035

This makes it so the buttons appear "pressed" while streaming/recording
to more visibly help indicate that they are currently active.

Closes jp9000/obs-studio#1039

linux-alsa: Display the "Custom" entry once only

The OBSBasicFilters window did not register a handler for the
"update_properties" signal. Now it does. Addresses issue #1028.

Closes jp9000/obs-studio#1036

(This commit also modifies the deps/media-playback, obs-ffmpeg, and
win-dshow modules)

More fixes due to ffmpeg renaming some constants and deprecating
AVFMT_RAWPICTURE and AV_PIX_FMT_VDA_VLD.
Latter replaced by AV_PIX_FMT_VIDEOTOOLBOX per ffmpeg dev advice.

Closes jp9000/obs-studio#1061

Prevents an issue where the output duplicator would cause the program to
crash if the graphics driver crashes and the graphics subsystem needs to
be rebuilt.

Closes jp9000/obs-studio#1076

The default value in the .ui file was out of sync so the signal to
update the stacked widget was never sent.

Fixes https://obsproject.com/mantis/view.php?id=1060

Closes jp9000/obs-studio#1030

This is to prevent confusion with video_thread in
libobs/media-io/video-io.c, which is used exclusively for video
encoding/output.  Also prevents confusion in the profiler log data.

CI: Update Travis script to target OSX 10.10+

Closes jp9000/obs-studio#1056

Closes jp9000/obs-studio#1054

Log Windows 10 Gaming Features (Game Mode)

enc-amf: Version 2.2.4

Updates the plugin to work better with the AMF Runtime version 1.4.6.0, which removed some experimental properties.

This commit addresses Mantis Bug 993. If no source was selected, the
"Copy" context menu item was enabled, but selecting it would do nothing.
This commit disables that menu item when no sources are selected.

UI: Fix Pulse Audio not loading saved device

libobs/util: Fix Windows 10 revision detection

UI: Disallow pasting duplicates of sources with DO_NOT_DUPLICATE

Fixes an issue where the log could have "Could not find service" with an
empty service name when opening properties.