externals: Update cubeb to the master version

common: Move Quaternion, Rectangle, Vec2, Vec3, and Vec4 into the Common namespace

gl_shader_disk_cache: Remove #pragma once from cpp file

This is only necessary in headers. Silences a warning with clang.

These types are within the common library, so they should be within the
Common namespace.

Keeps the audio library we use up to date.

These types are within the common library, so they should be using the
Common namespace.

Quaternion is within the common library, so it should be using the
Common namespace.

renderer_opengl: Update pixel format tracking

file_sys/vfs_vector: Fix ignored offset on Write

service/vi: Update IManagerDisplayService's function table

audio_core: Resolve compilation warnings

shader/track: Resolve variable shadowing warnings

Ensures that all member variables are initialized in a deterministic
manner across the board.

CubebSinkStream inherits from a base class with a virtual destructor, so
override can be appended to CubebSinkStream's destructor.

The name of the parameter was shadowing the member variable of the same
name. Instead, alter the name of the parameter to prevent said
shadowing.

The assignments here were performing an implicit truncation from int to
s16. Make it explicit that this is desired behavior.

Amends it to add the 7.0.0+ CreateStrayLayer function.

shader_decompiler: Improve Accuracy of Attribute Interpolation.

rasterizer_cache_gl: Only do fast layered copy on the same format.

Port citra-emu/citra#4655: "Remove GCC version checks"

service/vi: Convert Display and Layer structs into classes

Citra can't be compiled using GCC <7 because of required C++17 support, so these version checks don't need to exist anymore.

video_core/dma_pusher: The full list of headers at once.

vk_scheduler: Implement a scheduler

gl_rasterizer_cache: Fixup parameter order in layered swizzle

vk_memory_manager: Fixup commit interval allocation

VKMemoryCommitImpl was using as the end of its interval "begin + end".
That ended up wasting memory.

The scheduler abstracts command buffer and fence management with an
interface that's able to do OpenGL-like operations on Vulkan command
buffers.

It returns by value a command buffer and fence that have to be used for
subsequent operations until Flush or Finish is executed, after that the
current execution context (the pair of command buffers and fences) gets
invalidated a new one must be fetched. Thankfully validation layers will
quickly detect if this is skipped throwing an error due to modifications
to a sent command buffer.

vk_memory_manager: Implement memory manager

The NVFlinger service is already passed into services that need to
guarantee its lifetime, so the BufferQueue instances will already live
as long as they're needed. Making them std::shared_ptr instances in this
case is unnecessary.

Like the previous changes made to the Display struct, this prepares the
Layer struct for changes to its interface. Given Layer will be given
more invariants in the future, we convert it into a class to better
signify that.

With the display and layer structures relocated to the vi service, we
can begin giving these a proper interface before beginning to properly
support the display types.

This converts the display struct into a class and provides it with the
necessary functions to preserve behavior within the NVFlinger class.

gl_state: Synchronize gl_state even when state is disabled

video_core: Remove usages of System::GetInstance() within the engines

* Fixes Unicode Key File Directories

Adds code so that when loading a file it converts to UTF16 first, to
ensure the files can be opened. Code borrowed from FileUtil::Exists.

* Update src/core/crypto/key_manager.cpp

Co-Authored-By: Jungorend <Jungorend@users.noreply.github.com>

* Update src/core/crypto/key_manager.cpp

Co-Authored-By: Jungorend <Jungorend@users.noreply.github.com>

* Using FileUtil instead to be cleaner.

* Update src/core/crypto/key_manager.cpp

Co-Authored-By: Jungorend <Jungorend@users.noreply.github.com>