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

With this, the video core is now has no calls to the global system
instance at all.

Render.Vulkan <Error> video_core/renderer_vulkan/renderer_vulkan.cpp:CreateInstance:131: Presentation not supported on this platform
Render.Vulkan <Error> video_core/renderer_vulkan/renderer_vulkan.cpp:CreateSurface:378: Presentation not supported on this platform
Core <Critical> core/core.cpp:Load:199: Failed to initialize system (Error 5)!

This is already initialized within the class body.

This doesn't modify internal member state.

Many of these implementations are used to implement a polymorphic
interface. While not directly used polymorphically, this prevents
virtual destruction from ever becoming an issue.

Casting from void* with static_cast is permitted by the standard, so we
can just make use of that instead.

Given the std::vector was const, an automatic move out of the function
could not occur.

We can allow automatic return value optimizations to occur by making the
buffer non-const.

Since yesterday, this breaks the build on linux.
So let's fix it.

- Should be no functional changes.

- Includes removing some service impls. that are untested.

- Includes removing some SVC impls. that are untested.

- Fixes Super Smash Bros. Ultimate.

- More consistent with other system components.