Use the Qt standard buttons in the source properties dialog to make the
UI consistent.  Also remove the right alignment of the button box to
allow Qt to align standard buttons on the left side of the dialog.

Closes jp9000/obs-studio#1013

Allows the ability to hide/unhide sources in the mixer that the user
doesn't care about or doesn't necessarily want to see (such as video
sources that have audio but don't have any audio playing).  If all
sources are hidden, the user can right-click the mixer's empty area and
choose "unhide all" via a context menu.

Closes jp9000/obs-studio#1002

Allows bringing up properties/filters/etc via right-clicking mixer items
in addition instead of only being able to click the gear icon.  Minor
QoL improvement.

Allows setting and sharing of user data for sources and scene items.

For those resolutions the last two chroma samples of every other
line would be overwritten by the last chroma samples of the previous
line (depending on sampler used), producing artifacts on the left
edge of the resulting image (e.g. any color present on the right
edge of the image would "bleed" to every other line on
the left edge)

Add fix to watch for VisibilityNotify events.

Fix XCB keyboard mapping size calculation

Uses the sink device names rather than the "Monitor of" names.

Closes jp9000/obs-studio#990

Closes jp9000/obs-studio#940

Checks if the system has Pulseaudio and enables support via the
HAVE_PULSEAUDIO flag.

Closes jp9000/obs-studio#940

Make *nix system info logging more like Windows/Mac

Closes jp9000/obs-studio#953

Closes jp9000/obs-studio#953

rtmp-services: Add looch.tv streaming platform

rtmp-services: Update ingest list for Restream.io

rtmp-services: Fix misspelled country name

This adds play/pause, restart, stop, next, and previous hotkeys to the
VLC source.

Closes jp9000/obs-studio#972

That had a misspell in a Twitch ingest server:
Col_u_mbia instead Col**o**mbia.
Incremented version.

Some encoders such as the AMD AMF encoder don't set their bitrate
property, so it gets returned as 0. This causes the new network code to
allocate a tiny buffer, resulting in output starvation and throttling
to the point of uselessness if low latency mode is also enabled.

rtmp-services: Add new twitch ingest servers

Fixes an issue where it would show the wrong error when the user entered
an invalid stream key, and logs it

Closes jp9000/obs-studio#1015

Closes jp9000/obs-studio#1015

rtmp-services: Update ingest list for Restream.io

obs-browser: version 1.30.1

Build with CEF 3112 on OSX

Fixes https://obsproject.com/mantis/view.php?id=508

The toggle_visibility set only by init_hotkeys() call, but used each
time in obs_sceneitem_destroy() call.  Because zero hotkey_pair_id is
valid - we need to set item property other than zero here.

Closes jp9000/obs-studio#1000

After the commit 3491487c obs_frontend_get_streaming_output()
returns NULL if "Start Streaming" button not pressed yet.  The code
would erroneously fail to update the recording/streaming status if
either one of them hadn't been activated yet.

Closes jp9000/obs-studio#999

If there are no slideshow items and this function is called, it would
cause a null pointer dereference.

This is a workaround for build server cmake build issues on mac/linux.
In the future, the build servers should specify the cmake variable.

Prevents a conflict with potentially existing plugins