Enable toggle buttons for keyboard and mouse

renderer_opengl: Use compute shaders to swizzle BGR textures on copy

buffer_cache: Heuristically decide to skip cache on uniform buffers

InputCommon: Mouse fixes

common: fiber: Use weak_ptr when yielding.

external: Update dynarmic

- Fixes another small leak.

- Avoids a memory leak, as taking a strong reference of the fiber here causes a circular reference.
- Supersedes #6006 with a more narrow fix.

hle: kernel: KThread: Rework dummy threads & fix memory leak.

- Dummy threads are created on thread local storage for all host threads.
- Fixes a leak by removing creation of fibers, which are not applicable here.

CMakeLists: Add /utf-8 compile option for MSVC

Revert "core: Switch to unique_ptr for usage of Common::Fiber."

externals: Update mbedtls to 2.16.9

core: Switch to unique_ptr for usage of Common::Fiber.

mbedtls 2.16 is the last version which has licensing for GPL 2.0. This updates mbedtls to our own fork of mbedtls 2.16

Ensures that the source and execution character sets are in UTF-8

In order to force the BGRA8 conversion on Nvidia using OpenGL, we need to forbid texture copies and views with other formats.

This commit also adds a boolean relating to this, as this needs to be done only for the OpenGL api, Vulkan must remain unchanged.

OpenGL does not natively support BGR internal formats, which causes many BGR textures to render incorrectly, with Red and Blue channels swapped.

This commit aims to address this by swizzling the blue and red channels on texture copies when a BGR format is encountered.

vk_command_pool: Reduce the command pool size from 4096 to 4

InputCommon: Use an unique client id for each udp socket instance

Network error handling reform

core: Shutdown: Move kernel cleanup to later in shutdown.

Some games benefit from skipping caches (Pokémon Sword), and others
don't (Animal Crossing: New Horizons). Add an heuristic to decide this
at runtime.

The cache hit ratio has to be ~98% or better to not skip the cache.
There are 16 frames of buffer.

- Fixes a shutdown crash due to a race condition with GPU still accessing memory.

[Service::nifm] Fix bcat_backend's default initialisation

gpu_thread: Remove Async NVDEC placeholders

This commit removes early placeholders for an implementation of async nvdec. With recent changes to the source code, the placeholders are no longer accurate, and can cause a nullptr dereference due to the nature of the cdma_pusher lifetime.

`network.cpp` has several error paths which either:
- report "Unhandled host socket error=n" and return `SUCCESS`, or
- switch on a few possible errors, log them, and translate them to
  Errno; the same switch statement is copied and pasted in multiple
  places in the code

Convert these paths to use a helper function `GetAndLogLastError`, which
is roughly the equivalent of one of the switch statements, but:
- handling more cases (both ones that were already in `Errno`, and a few
  more I added), and
- using OS functions to convert the error to a string when logging, so
  it'll describe the error even if it's not one of the ones in the
  switch statement.
  - To handle this, refactor the logic in `GetLastErrorMsg` to expose a
    new function `NativeErrorToString` which takes the error number
    explicitly as an argument.  And improve the Windows version a bit.

Also, add a test which exercises two random error paths.

core: hle: ldn: Error out on call to Initialization.

HID: Implement gestures