common/detached_tasks: Wait for tasks before shutting down

input_common/mouse_input: Fix data race

npad: Fix data race when updating devices

common: fs: Miscellaneous changes

service: spl: Implement general SPL service

service: time: Use GetFileRelative to get files within subdirectories

This provides a more concrete example of what a regular file is and isn't.

These enforce requiring the file to exist prior to opening.

This check was preventing files with the Write or Append file access modes from being created, as per the documented behavior in FileAccessMode.
This amends the check to test for the existence of a filesystem object prior to checking whether it is a regular file.
Thanks to liushuyu for pointing out that removing the check altogether would not guard against attempting to open non-regular files such as directories, symlinks, FIFO (pipes), sockets, block devices, or character devices.
The documentation has also been updated for these functions to clarify that a file refers to a regular file.

Similarly, Flush() is typically called to attempt to flush a file into the disk. In the one case where this is used, we do not care whether the flush has succeeded or not, making [[nodiscard]] unnecessary.

There are a lot of scenarios where we don't particularly care whether or not the removal operation and just simply attempt a removal.

As such, removing the [[nodiscard]] attribute is best for these functions.

vk_master_semaphore: Use jthread for debug thread

ci: windows: Copy the Qt styles directory when packaging

core: Make is_powered_on atomic

Fixes potential data races when shutting down.

If this is not waited on, the synchronization primitives are destroyed
whe main exits and the detached task ends up signalling garbage and not
properly finishing.

Add a lock to avoid data races.
This reduces the number of -fsanitize=thread errors significantly.

Fix data race using std::jthread and std::stop_token.

kernel: Fix missing peak set in KResourceLimit::SetLimitValue

Update dynarmic and add new unsafe CPU option.

nvflinger: Add experimental toggle to disable buffer swap interval limits

externals: httplib: replace custom httplib header with upstream as submodule

Qt can make use of qwindowsvistastyle.dll if present, and our MinGW
container has the library, but it was not being copied during the
packaging process. Thus, yuzu looked like a Windows 98 application when
using the PR-verify artifacts.

This copies over the DLL during packaging, for that sweet-sweet Windows
Vista style.

In addition, set the Qt plugins path instead of the plugins/platforms
path. This way we can use the directory directly, rather than appending
a `..` everytime we need something just outside of it.

host_memory: Correct MEM_RESERVE_PLACEHOLDER

Microsoft defines `MEM_RESERVE_PLACEHOLDER` as `0x00040000`, but our
manually imported version of it drops the last zero.

This also includes a minor change to web_service.cpp - to fix compatibility with upstream changes.

update submodule discord-rpc to latest [now deprecated]

The timezone info file can be within subdirectories (such as Asia/Tokyo), use GetFileRelative instead of GetFile to get files within subdirectories.

vulkan_debug_callback: Skip logging known false-positive validation errors

Avoids overwhelming the log with validation errors that are not applicable

Enabling this setting will allow some titles to present more frames to
the screen as they become available in the nvflinger buffer queue.

Audio: SDL2 audio backend

texture_cache/util: Avoid relaxed image views on different bytes per block

textures: Add a toggle for GPU Accelerated ASTC decoder 

fsp_srv: Fix filesystem access logging