This is mostly for win32-specific files

SWIG will fail because it doesn't define _MSC_VER and because it doesn't
know what to do with things like __attribute__.

When splitting a string in to a string list via stringlist_split, it
would previously allocate memory for each sub-string and again for the
list itself.  This optimizes that function to use a single contiguous
chunk of memory for the sake of access optimization and memory
allocation efficiency.

Uses type_data to get the type-specific data of a source type

Uses type_data to get the type-specific data of a source type

(Note: This commit also modifies UI and test)

This makes it so that main preview panes are rendered with the main
output texture rather than re-rendering the main view.  The view will
render all objects again, whereas the output texture will be a single
texture render of the same exact thing.

Also fixes some abnormal artifacting when scaling the main preview pane.

Previously if the key didn't exist it would return uninitialized stack
memory. Reported at https://obsproject.com/forum/threads/obs-freezes-computer-on-startup-sometimes.78030/#post-330590

If the target process re-creates its D3D context, the game capture tick
can trigger before the capture is setup, in which case OBS gets a
CAPTURE_RETRY message. However with the memory capture method, it
continues to try and copy from the shared memory pointer which is no
longer valid, resulting in a crash. The fix uses the old texture until
the next tick at which point the new capture should be ready for use.

Windows SDK 10.0.16299.0 defines these structures as part of winternl.h
but using different types and names. Unfortunately there's no macro to
detect the SDK version, so to avoid conflicting with newer / older SDKs
the OBS structs have been renamed.

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