Closes obsproject/obs-studio#1563

A mono input with surround output is upmixed by swresampler by routing
it to FC (front center) by default which corresponds to third channel
for 3.0, 4.0, 4.1, 5.0, 5.1, 7.1. (The other channels are muted.)
But the volume meters are set to show the first channel for mono sources.
Therefore although audio is processed, it would not show on the meter.
This fixes this display issue.

Closes obsproject/obs-studio#1540

decklink: Add declaration file for integer types

Closes obsproject/obs-studio#1568

win-mf: Initialize member variable

Addresses mantis issue 0000702.

Closes obsproject/obs-studio#1553

Closes obsproject/obs-studio#1551

libobs: Fix audio offset not reset for all tracks

obs-libfdk: Compatibility fix for new API

Closes obsproject/obs-studio#1567

Use /LARGEADDRESSAWARE linker option when compiling 32bit executables on
Windows.

Closes obsproject/obs-studio#1546

UI: Fix batch remux compiler warning

Closes obsproject/obs-studio#1521

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.

fdk-aac v2.0.0 (aacenc 4.0.0) changes the AACENC_InfoStruct:
the encoderDelay parameter is replaced by two, nDelay and
nDelayCore. This patch checks the lib version and adjust the parameter
accordingly.

libobs: memset() the correct buff size

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

Track 1 offset is reset but not the offset for other tracks.
This caused sync issues in between tracks (with track 1 and others).
(bug found by EposVox)

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.