OpenGL macOS headers definitions clash heavily with each other

This commit aims to help easing debugging of driver crashes without
having to modify existing code.

Co-Authored-By: Vitor K <vitor-k@users.noreply.github.com>

Presentation context always has GL_DRAW_FRAMEBUFFER_BINDING as zero.
There is no need to bind the default framebuffer constantly.

According to Nsight this was using ~0.7ms per frame and it broke
renderdoc captures.

Create Vulkan instances and surfaces from the Vulkan backend.

Changes the GraphicsContext to be managed by the GPU core. This
eliminates the need for the frontends to fool around with tricky
MakeCurrent/DoneCurrent calls that are dependent on the settings (such
as async gpu option).

This also refactors out the need to use QWidget::fromWindowContainer as
that caused issues with focus and input handling. Now we use a regular
QWidget and just access the native windowHandle() directly.

Another change is removing the debug tool setting in FrameMailbox.
Instead of trying to block the frontend until a new frame is ready, the
core will now take over presentation and draw directly to the window if
the renderer detects that its hooked by NSight or RenderDoc

Lastly, since it was in the way, I removed ScopeAcquireWindowContext and
replaced it with a simple subclass in GraphicsContext that achieves the
same result

Adds a Qt and SDL2 frontend for Vulkan. It also finishes the missing
bits on Vulkan initialization.

MakeCurrent is a costly (according to Nsight's profiler it takes a tenth
of a millisecond to complete), and we don't have a reason to call it
because:
- Qt no longer signals a warning if it's not called
- yuzu no longer supports macOS

We can make this message more meaningful by indicating the location the
screenshot has been saved to. We can also log out whenever a screenshot
could not be saved (e.g. due to filesystem permissions or some other
reason).

Treating it as a u16 can result in a sign-conversion warning when
performing arithmetic with it, as u16 promotes to an int when aritmetic
is performed on it, not unsigned int.

This also makes the interface more uniform, as the layout interface now
operates on u32 across the board.

This class contains non-trivial members, so we should default the
destructor's definition within the cpp file.

Same thing (for platforms we support), less reading.

This function is defined as taking an int, not a bool.

We can just pass a pointer to GMainWindow directly and make it a
requirement of the interface. This makes the interface a little safer,
since this would technically otherwise allow any random QWidget to be
the parent of a render window, downcasting it to GMainWindow (which is
undefined behavior).

We can just invoke these functions by qualifying the object name before
the function.

There's no performance improvement in passing an unsigned pair by
reference.

Allows the bootmanager code to compile with implicit string conversions
disabled.

Nvidia's proprietary driver creates a real OpenGL compatibility profile
without this option, meanwhile Intel (and probably AMD, I haven't tested
it) require that QSurfaceFormat::FormatOption::DeprecatedFunctions is
explicitly enabled.

This option allows picking the compatibility profile since a lot of bugs
are fixed in it. We devs will use this option to easierly debug current
problems in our Core implementation.:wq

The default constructor will always run, even when not specified, so
this is redundant.

However, the context member can indeed be initialized in the constructor
initializer list.

Resolves -Wreorder warnings. These will automatically be initialized to
nullptr anyways, so these were redundant.

Since C++17, the introduction of deduction guides for locking facilities
means that we no longer need to hardcode the mutex type into the locks
themselves, making it easier to switch mutex types, should it ever be
necessary in the future.

While we are at it, remove nullptr checks for deletion, since the C++
standard defines that delete does it by its own

Changes the interface as well to remove any unique methods that
frontends needed to call such as StartJoystickEventHandler by
conditionally starting the polling thread only if the frontend hasn't
started it already. Additionally, moves all global state into a single
SDLState class in order to guarantee that the destructors are called in
the proper order

With the loading screen merged, we don't want to actually show at this
point, but it still needs to be shown to actually create the context.
Turns out you can just show and hide it immediately and it'll work.