Implement W-buffer and fix depth-mapping

gdbstub: Silence missing prototype warnings

gl_rasterizer: Fix compilation for debug builds

Pica: PicaShaderConfig is TC and cleared before use

dyncom: Reset the context into user mode correctly

The other mode was system mode.

source: Fix missing logging arguments

Silences two warnings on OSX.

Swap: Minor changes

These shouldn't haphazardly convert types

This isn't well-defined in C++.

Also gets rid of pointer data variants as this prevents the use of
the regular swapping routines as unary predicates in std lib functions.

They also cast to stricter alignment types, which is undefined behavior.

Kernel/Threading: Warn when a thread can be scheduled in the Syscore (Core 1)

fixup simple type conversions where possible

HLE/Applets: Use the correct size for the framebuffer SharedMemory

We do not currently implement any cores other than the AppCore (Core 0).

AudioCore: SDL2 Sink

HLE/Applets: Use the correct size for the framebuffer SharedMemory in the swkbd and MiiSelector applets.

Move glad initialisation to the frontend

fix loader: return proper result

On SDL2 this allows it to use SDL_GL_GetProcAddress() instead of the
default function loader, and fixes a crash when using apitrace with an
EGL context.

On Qt we will need to migrate from QGLWidget to QOpenGLWidget and
QOpenGLContext before we can use gladLoadGLLoader() instead of
gladLoadGL(), since the former doesn’t expose a function loader.

hle: Get rid of direct global access to g_reschedule

Qt: display game icon and title in the game list

Layout Mii parameters input/output, and return success as result of applet work

Pica: Rename VertexLoaded breakpoint to VertexShaderInvocation

DSP/HLE: Implement Source processing