Vulkan's VertexIndex and InstanceIndex don't match with hardware. This
is because Nvidia implements gl_VertexID and gl_InstanceID. The math
that relates these is:

gl_VertexIndex = gl_BaseVertex + gl_VertexID
gl_InstanceIndex = gl_InstanceIndex + gl_InstanceID

To emulate it using what Vulkan's SPIR-V offers (the *Index variants)
this commit substracts gl_Base* from gl_*Index to obtain the OpenGL and
hardware's equivalent.

address_arbiter: Minor cleanup to list querying

Same behavior, but without the need to explicitly loop through
everything manually.

Simplifies the overall function and also allows for it to become a
const-qualified member function.

bcat/backend: Prevent fmt exception in debug log within NullBackend::Clear()

kernel/thread: Remove trivial usages of the global system accessor

Aligns the '=' to be consistent with the rest of the logs within this
source file.

A formatting specifier within Clear wasn't being used, which will cause
fmt to throw an exception. This fixes that.

We can just use the kernel member variable directly instead of going
through the system to obtain the same thing.

gl_rasterizer: Implement GL_POINT_SPRITE

maxwell_3d: Fix stencil back mask

Remove option "Show files with type 'Unknown'"

hle: services: Use std::shared_ptr instead of copy by value.
- This is a prerequisite to adding a mutex to `ServiceFramework`, which cannot be copied.
- This will be used for threaded services.

gpu_thread: Use MPSCQueue for GPU commands.

video_core: memory_manager: Use GPU interface for cache functions.

- Necessary for multiple service threads.

maxwell_to_gl: Implement R8G8_USCALED

shader/shift: Implement SHF

hle: services: Fix prepo IPC, and add better error checking.

gl_rasterizer: Fix instanced draw arrays

applets: Fixes for software keyboard and transfer memory.

- This was holdover from citra.

vk_rasterizer: Use noexcept methods of std::bitset

Removes bounds checking from "texceptions" instances.

shader/bfi: Implement register-constant buffer variant

OpenGL core defaults to GL_POINT_SPRITE, meanwhile on OpenGL
compatibility we have to explicitly enable it. This fixes
gl_PointCoord's behaviour.

shader/arithmetic: Implement FCMP