Download FFmpeg package version 4.3.1. Uses a file defined within the
package to determine with DLLs to copy.

Also corrects a submodule name.

udp: Silence warnings on Clang 12

video_core: Remove unused functions and variables

Simply mark them as unused for now.

Prevents compilation errors on clang 12 due to incomplete types within a
unique_ptr member.

Resolves warnings on clang 12

Silences a few warnings on clang 12.

* Add some depth to ProJoysticks

* address comments

* clang

* address nits

* fix wrong inner_offset when offset.x was 0

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.