When this was being fixed up, the incorrect function name was used --
however it still compiled because the author was using the newer FFmpeg
version at the time.

The AVCodecParameters weren't introduced until avcodec version 57.48.101
(FFmpeg version 3.1), so this will make sure to still use the older
avcodec_copy_context if the detected FFmpeg version is earlier.

Fixes a number of warnings with all modules

cmake: Correct CMake checks for LINUX

Some CMake checks were recently switched from UNIX to LINUX to get them
to not apply to macOS/OSX. Since LINUX doesn't seem to be defined,
switch these checks to UNIX AND NOT APPLE.

Revert "CI: Linux - Install FFmpeg from source"

This reverts commit de32d89f.

Fixes an issue where Linux CI builds fail because FFmpeg fails to
compile. Using FFmpeg git master in CI builds was obviously not the
smartest idea because changes in FFmpeg can break things unexpectedly.
Sorry about that.

The reason for the original commit was that OBS failed to compile
with FFmpeg 2.4. That has been fixed since.

git: Add Clion to .gitignore

cmake: Do not require X11 on OSX

CI: Fix Mac 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 finally fixes macOS deployments on
Travis for Xcode 8.3. This commit also reverts a few changes that got
into master while we were trying to fix this.

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.