Testing shows that Poll called with zero entries returns -1 and signals
an errno of zero.

This implements: Socket, Poll, Accept, Bind, Connect, GetPeerName,
GetSockName, Listen, Fcntl, SetSockOpt, Shutdown, Recv, RecvFrom,
Send, SendTo, Write, and Close

The implementation was done referencing: SwIPC, switchbrew, testing
with libnx and inspecting its code, general information about bsd
sockets online, and analysing official software.

Not everything from these service calls is implemented, but everything
that is not implemented will be logged in some way.

Manage worker threads with an easy to use abstraction.
We can expand this to support thread deletion in the future.

This abstraction allows executing blocking functions (like recvfrom on a
socket configured for blocking) without blocking the service thread.
It is intended to be used with SleepClientThread.

These functions translate from Network enumerations/structures to guest
enumerations/structures and viceversa.

Add guest enumerations and structures used in socket services

This is trivially implemented using the Network abstraction

- Used by ftpd

core_timing: Make use of uintptr_t to represent user_data

qt_themes: Set QLabel background color to transparent for Dark and Midnight Blue themes

Makes the interface future-proofed for supporting other platforms in the event we ever support platforms with differing pointer sizes. This way, we have a type in place that is always guaranteed to be able to represent a pointer exactly.

vulkan: Resolve -Wmissing-field-initializer warnings

AM: GetDesiredLanguage: remove unused variable

video_core/gpu: Correct the size of the puller registers

GCAdapter: only join worker thread if running & joinable

The puller register array is made up of u32s however the `NUM_REGS` value is the size in bytes, so switch it to avoid making the struct unnecessary large. Also fix a small typo in a comment.

nvflinger: Use return value of Lock()

udp/client: Remove unused boost include

virtual_buffer: Mark size parameter of FreeMemoryPages() as [[maybe_unused]]

gc_adapter/gc_poller: Resolve compiler warnings

yuzu/configure_debug: Remove duplicated checkboxes

Those are already found in the Filesystem tab.
They were added back to the Debug tab by mistake in the Vulkan PR.

Not using the return value of these functions are undeniably the source
of a bug. This way we allow compilers to loudly make any future misuses
evident.

comex reported in #4424 that we were incorrectly discarding the return
value of Lock() which is correct.

hid: Only update keyboard & debug pad inputs if enabled

This function was relocated to log.h as a constexpr function, so this
can be removed.

Fixes the override highlights in per-game settings from looking weird when viewed on the Dark or Midnight Blue themes by setting QLabels to have transparent backgrounds by default.

Also apparently adds a newline to the end of the Dark theme's qss file.

Also silences a deprecation warning from boost on Clang/GCC.

This isn't used on Windows, but is used on non-Windows operating
systems.

swkbd: Return result for Calc request for inlined swkbd

frontend: Match indeterminate checkbox state with light theme

vk_rasterizer: Remove unused variable in Clear()

qt-themes: Add Midnight Blue qdarkstyle theme (2.8.1)

configure_per_game: Clearer per-game settings

buffer_cache: Eliminate redundant map lookup in MarkRegionAsWritten()