If audio monitoring is enabled and set to output only, the
obs_source_show_preloaded_video function would still incorrectly set the
current source audio output timestamp to the current system time, which
would cause audio to use an incorrect starting point from long ago for
the first starting audio segment if audio monitoring is then turned off
some time after having started the source.

Instead, the starting timestamp should be set to 0 if audio monitoring
is enabled with no output to stream, so that if/when audio monitoring is
disabled, it recalculates the starting timestamp of the first audio
packet on the spot again.

Closes obsproject/obs-studio#1522

Closes obsproject/obs-studio#1533

Allows the ability for services to specify alternate or old names that
they used to have in the json service list so they can safely be renamed
seamlessly and use the proper service settings.  This way, if a user is
using an older service in their configuration, it can still detect which
service it's supposed to be using and apply those service-specific
settings for that user.

Add status badges to README

UI: Remove scrollbar line controls for Dark theme

Closes obsproject/obs-studio#1530

Closes obsproject/obs-studio#1529

UI: Fix bug when loading saved projectors

Certain windows functions may allow 0 as a valid handle value, therefore
INVALID_HANDLE_VALUE is a more appropriate initialization value.

Closes obsproject/obs-studio#1519

ui: Emit STREAMING_STOPPING when stop queued

When calling obs_display_set_background_color, the value set in the
'color' parameter should always be used as-is.  0 should not indicate a
color other than black.  To do anything otherwise is silly and confusing
for users of the API.

Closes obsproject/obs-studio#1516

decklink: Initialize member variable

CI: Use proper VLC release tarball

As noted by ePirat, the VLC releases on GitHub are not official
releases, just repo snapshots. Use the official VLC 3.0.4 release
tarball to ensure maximum stability.

CI: Use VLC 3.0.4 instead of master for macOS

Fixes an issue where macOS builds on Travis would fail due to changes
in VLC master branch.

libobs: memset() the correct buff size

Fixes a bug where audio panning would always be processed even if
panning was centered (and thus inactive).

AppVeyor recently updated their Qt version to 5.11.2 which breaks
builds, because of the outdated path. Using this path should always
ensure that the newest subversion of Qt 5.11 gets used.

Fixes an issue when it's hard to perform drag-by-mouse move of the
scrollbar while handle is at corner and has minimum size.

Info: the handle minimum size styled as 20px, while add/sub-line is
14px, thus only 6px left for mouse drag when handle resides at corner.
While handle styled to cover whole bar including, subcontrol elements,
it is better to remove the hidden subcontrols completely.

This fixes a bug on Linux where fullscreen projectors wouldn't
quite be fullscreen when loaded on start.

If there's a delay, it will *also* be ommitted after the appropriate
number of seconds.

I was originally going to add a new event for this, however this is
consistent with STREAMING_STARTING, which is emitted at the start
of the delay, not the end.

This allows multiple audio tracks for the FFmpeg output.

Closes obsproject/obs-studio#1351

Closes obsproject/obs-studio#1304

Closes obsproject/obs-studio#1507

Closes obsproject/obs-studio#1506

enc-amf: Update to 2.5.0.1 and update repository address

UI: Fix typo with resize output text

This reverts commit 5edeaa30, reversing
changes made to 0d280819.

Decklink: Add decklink output