decklink: Rename 5.1 and 7.1 multi-channel formats

The studio mode double-click scene switching option disables scene
duplication, which bypasses the user's settings for scene switching in
studio mode.  This fixes it so that scenes are properly duplicated
according to the user's settings.

Moves the multiview (fullscreen/window) options to the view menu to
reduce context menu clutter, and allow using it even when not in studio
mode.

Also adds missing translation strings.

Scissor rects would affect the internal effect rendering of sources, so
scissor rectangles aren't the ideal method of restricting draw space.
Instead, use viewports and projection matrices, which are automatically
accounted for by internal source handling.

Adds a sidechain (ducking) option to the compression filter.

Adds circlebuf_push_front_zero and circlebuf_push_back_zero to
conveniently push zeroed data to the front/back of the buffer without
having to create an intermediary buffer to accomplish the same thing.

Common multi-channel setup is 5.1 and 7.1 with rear speakers.

Thus only setups that include SPEAKER_SIDE_LEFT and SPEAKER_SIDE_RIGHT
needs the marking as not common (or "side" use), while it stays the
true Side setup (with side speakers) by its internal meaning.

This "side" is named "surround" by Microsoft. To not confuse users and
translators, it is wise to use "Side" mark next to format name.

rtmp-services: Remove Coderwall / Fix Livestream service name

CI: Fix curl download if file doesn't exist

rtmp-services: Add Mobcrush to services list

Fixes an issue where media-playback would not compile with older FFmpeg
versions due to the fact that the AV_PIX_FMT_VIDEOTOOLBOX was
unavailable until version 54.31.100 of libavutil (FFmpeg 2.8).

Fixes mantis issue 1045.

Closes jp9000/obs-studio#1089

Certain NVIDIA GPUs don't support NVENC, but ship with the NVENC
library, causing OBS to mistakenly think that NVENC is available when it
actually isn't.

Closes jp9000/obs-studio#1087

This commit adds Mobcrush RTMP ingest to services.json.

CI: Fix macOS builds on Travis CI's Xcode 8.3 image

The Travis CI Xcode 8.3 image uses macOS 10.12, where some OS and Xcode
components were changed. This commit should hopefully fix macOS
deployments on Travis for Xcode 8.3.

Jim note:

- Refactored code significantly
- Added a context menu option to exclude specific scenes from projectors
- Made it so multiview projectors update when scenes are
  added/removed/renamed
- Increased text quality
- Removed the color sources and replaced them with simple solid
  rectangles
- Increased the border size of "program" and "preview" scenes in the
  lower scene list

Closes jp9000/obs-studio#1068

Convenience function for setting a color (in hex format, e.g.
0xAARRGGBB)

CI: Fix Mac builds on Travis CI's Xcode 8.3 image

This reverts commit ca835ddf.

The Travis CI Xcode 8.3 image uses macOS 10.12, where some changes were
made to productsign, and Apple's documentation didn't clearly reflect
this. This commit should fix Mac builds on Travis for Xcode 8.3 and
clean up the job log.

CI: OSX - Use Xcode7.3

Travis changed the default OS X build environment from Xcode7.3 to
Xcode8.3 and it seems to have broken the packaging step somehow.
Fixes the issue by reverting to Xcode7.3.

The scene override would trigger, but the scene override variable would
stay set, causing the next transition to be the same one that was
previously used for overriding.

Fixes an issue where quick transitions would not function if the scene
has a transition override set for it.

If a preview projector was created in normal mode, it would become a
studio projector in studio mode.  The window title of the window
projector would reflect that it was in fact a preview projector and not
a program projector.

Allows the ability to override what specific transition a scene may use
when transitioning to it.

(Original proposal by cg2121, reworked by Jim)

Closes jp9000/obs-studio#1052

Ensures that private settings data is also duplicated when a scene or a
source is duplicated.

The studio mode program view projectors used the wrong saving mechanism.
The save data was copied from the source projectors, which were
dependent on string values, where as it should have been using a boolean
true/false value for specific monitors.

Implement automatic audio device selection for devices that use two
separate DirectShow filters for audio and video instead of having a
single filter with audio and video output pins.

Please note that this fix is currently only active for Elgato USB and
PCIe devices (e.g. Cam Link, HD60 S, HD60 Pro, 4K60 Pro) to avoid
unintentionally changing the behavior for any other devices (e.g.
webcams).

(Jim edit: This fixes an issue with newer Elgato devices where the
devices would not automatically have their audio coupled with the video;
users would have to manually select the audio device in order to get
audio functioning.)

Closes jp9000/obs-studio#1081

This commit adds a checkbox to general setting to allow users to enable
a vertically oriented layout for studio mode.

This commit addresses mantis issue 827:
https://obsproject.com/mantis/view.php?id=827

Closes jp9000/obs-studio#1072

Fixes a bug where the OBSBasic::programScene variable would not be set
for the new program scene when switching scenes via double-clicking on
them.

libobs: Fix height return value condition

This should fix "Output fails" when Rescale Output height set to 0.

(Note: This commit also modifies libobs-d3d11 and libobs-opengl)

Allows the ability to flush data directly without having to use the
buffer's internal data.

Allows the caller to manage his/her own vertex/index buffer data if
desired, working around the design flaw of having to rely on a
vertex/index buffer's internal data.

Prevents from having to pass ownership of buffer data from caller when
using gs_vertexbuffer_create() or gs_indexbuffer_create() (which is a
design flaw).