This behavior also needs to be visible for MinGW builds as well.

Instead of holding a reference that will get invalidated by
dma_pushbuffer.pop(), hold it as a copy. This doesn't have any
performance cost since CommandListHeader is 8 bytes long.

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).

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.

This function didn't have a definition, so we can remove it to prevent
accidentally attempting to use it.

Moves the data members to satisfy the order they're declared as in the
constructor initializer list.

Silences a -Wreorder warning.

Because of the recent separation of GPU functionality into sync/async
variants, we need to mark the destructor virtual to provide proper
destruction behavior, given we use the base class within the System
class.

Prior to this, it was undefined behavior whether or not the destructor
in the derived classes would ever execute.

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.

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

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

This is a TODO carried over from Citra that doesn't apply here.

Removes a few inclusion dependencies from the headers or replaces
existing ones with ones that don't indirectly include the required
headers.

This allows removing an inclusion of core/memory.h, meaning that if the
memory header is ever changed in the future, it won't result in
rebuilding the entirety of the HLE services (as the IPC headers are used
quite ubiquitously throughout the HLE service implementations).

Addresses issues where a user in fullscreen could not exit some web applets without leaving fullscreen.

Significantly tidies up two guard conditionals.

Makes the interface uniform when it comes to checking various memory
regions.

Given we already pass in a reference to the kernel that the shared
memory instance is created under, we can just use that to check the
current process, rather than using the global accessor functions.

This allows removing direct dependency on the system instance entirely.