There's no real need to use a shared lifetime here, since we don't
actually expose them to anything else. This is also kind of an
unnecessary use of the heap given the objects themselves are so small;
small enough, in fact that changing over to optionals actually reduces
the overall size of the HLERequestContext struct (818 bytes to 808
bytes).

For whatever bizarre reason, Apple only made a few of std::optional's
member functions available on newer SDK versions. Given we can't even
run yuzu on macOS, and we keep the builder around to ensure that it
always at least compiles on macOS, we can bump this up a version.

This makes the class much more flexible and doesn't make performing
copies with classes that contain a bitfield member a pain.

Given BitField instances are only intended to be used within unions, the
fact the full storage value would be copied isn't a big concern (only
sizeof(union_type) would be copied anyways).

While we're at it, provide defaulted move constructors for consistency.

web_browser: Add shortcut to Enter key to exit applet

kernel/client_session, kernel/server_session: Make data members private

yuzu: add a hotkey to switch between undocked and docked mode

service/audio/audout_u: Only actually stop the audio stream in StopAudioOut if the stream is playing

Asynchronous GPU command processing

service/audio/audout_u: Only actually stop the audio stream in StopAudioOut if the stream is playing

The service itself only does further actions if the stream is playing.
If the stream is already stopped, then it just exits successfully.

 gl_rasterizer_cache: Move format conversion functions to their own file 

core/hle/ipc: Remove unnecessary includes

core: Remove the global telemetry accessor function

kernel/address_arbiter: Convert the address arbiter into a class

hle/service/audio/audout_u: Correct lack of return in failure case of AppendAudioOutBufferImpl()

yuzu/debugger/wait_tree: Remove use of global CurrentProcess accessor

Previously we were overwriting the error case with a success code
further down (which is definitely not what we should be doing here).

svc: Move memory range checking functions to the VMManager class

hle/service/audio: Extract audio error codes to a header

video_core/engines: Remove unnecessary includes

{kernel/thread, video_core/surface}: Remove obsolete TODOs

We already have the thread instance that was created under the current
process, so we can just pass the handle table of it along to retrieve
the owner of the mutex.

Removes a few unnecessary dependencies on core-related machinery, such
as the core.h and memory.h, which reduces the amount of rebuilding
necessary if those files change.

This also uncovered some indirect dependencies within other source
files. This also fixes those.

Makes it much nicer to locally reason about server session behavior, as
part of its functionality isn't placed around other classes.

These can be made private, as they aren't accessed in contexts that
require them to be public.

Places all error codes in an easily includable header.

This also corrects the unsupported error code (I accidentally used the
hex value when I meant to use the decimal one).

Allows getting rid of reliance on the global accessor functions and
instead operating on the provided system instance.

- Invert conditions into guard clases where applicable.
- Mark std::vector parameter of WakeThreads as const

Places all of the functions for address arbiter operation into a class.
This will be necessary for future deglobalizing efforts related to both
the memory and system itself.

This isn't needed anymore, according to Hexagon