cmake: Revert FFmpeg 4.3.1 update for Windows builds

The new 4.3.1 externals build seems to not be compatible with yuzu. This also fixes an oversight when renaming CMake variables.

cmake: FFmpeg linking rework

olsc: Stub GetSaveDataBackupSetting

Prevent over scheduling audio events and add motion update unschedule event

string_util: Remove MSVC workaround for converting between UTF8/UTF16

This has been fixed as of Visual Studio 2019 Version 16.2

Settings: Make settings controller image change with controller input

svc: Provide more detailed error logs for svc functions

renderer_opengl: Update OpenGL backend version requirement to 4.6

video_core: Delete morton

moron.h & morton.cpp are not used anywhere and are just empty files

lm: Fix ReadLeb128

pl_u: Fix read out of bounds

Fixes assertion on Bloodstained Ritual of the Night.

We would over read sometimes, this is fixed by checking if the top bit is set in the first iteration. We also lock the loop off to be only the max size of the type we can fit. Finally we changed an incorrect print of "DEBUG" to "TRACE" to reflect the proper log severity

ring_buffer: Remove granularity template argument

k_address_arbiter: Minor cleanup

Non-obvious bug in RingBuffer::Push(std::vector<T>&) when granularity != 1

Just remove it altogether because we do not have a use for granularity != 1

HID: Update the HID service to match more closely to switchbrew part 1

Allows for more descriptive error messages and also doesn't hide
control-path exit returns from the reader.

This is a useful function in a generic context or with types that
overload unary operator&. However, primitives and pointers will never do
this, so we can opt for a more straightforward syntax.

This code is never used, so we can remove it. It's in version control,
so it can always be brought back when needed.

Target a specific release version rather than some random development
commit.

Sets YUZU_USE_BUNDLED_FFMPEG as a CMake dependent option that is OFF on
Linux and ON for WIN32 targets. If FFmpeg is not found when
YUZU_USE_BUNDLED_FFMPEG is OFF, the bundled module/binaries are used
instead.

Reverts earlier changes to FindFFmpeg a bit, mostly to keep parity with
it's Citra version a bit. Now _FFmpeg_ALL_COMPONENTS lists all
components. We overwrite FFmpeg_LIBRARIES and FFmpeg_INCLUDE_DIR after
using the module.

Allows SVC calls to have much more informative information during error
cases. This also doesn't hide control flow returns from the reader.

Kernel Rework: Refactor KEvent/KReadableEvent/KWritableEvent

Minimal binaries go brrrrrrr

k_priority_queue: Minor cleanup

Tells CMake to look for either nasm or yasm as it is required to build
FFmpeg. Avoids a compile-time error by checking for it during
configuration.

Adds a workaround for Ubuntu Bionic's old version of make not
communicating jobserver details properly.