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

OpenGL: Don't copy const_color (Reverts #1745)

Pica: Replace logic in shader.cpp with loop

add config block 0x00170000; remove duplicated content

Fix video_core includes (and dependencies) using include-what-you-use

OpenGL: Copy TevStageConfig using a loop. Fixes bug: const_color not copied

Remove TGA dumper

Audio Config: Implement null sink and implement sink configuration

Update the stub code of NDM service!

ac:u: stub CloseAsync; align memory size in svc:GetProcessInfo(type=2)

gsp::Gpu: implement AcquireRight, ReleaseRight functions

AudioCore: CurrentRegion() -> ReadRegion(), WriteRegion()

AudioCore: Implement interpolation