Workaround an issue on Nvidia where creating a Vulkan instance from an
active OpenGL thread disables threaded optimization on the driver.
This optimization is important to have good performance on Nvidia
OpenGL.

Instead of using a two step initialization to report errors, initialize
the GPU renderer and rasterizer on the constructor and report errors
through std::runtime_error.

Ensure the behavior of the previous commit in tests.

Some games usually write memory pages currently used by the GPU, causing
rendering issues (e.g. flashing geometry and shadows on Link's
Awakening). To workaround this issue, Guest CPU writes are delayed until
the command buffer finishes processing, but the pages are updated
immediately.

The overall behavior is:
- CPU writes are cached until they are flushed, they update the page
  state, but don't change the modification state. Cached writes stop
  pages from being flushed, in case games have meaningful data in it.
- Command processing writes (e.g. push constants) update the page state
  and are marked to the command processor as dirty. They don't remove
  the state of cached writes.

 kernel: More accurately utilize resource_limit

This implements KScopedReservation, allowing resource limit reservations to be more HW accurate, and release upon failure without requiring too many conditionals.

* kernel: Unify result codes

Drop the usage of ERR_NAME convention in kernel for ResultName. Removed seperation between svc_results.h & errors.h as we mainly include both most of the time anyways.

* oops

* rename errors to svc_results

core: Silence various warnings on Clang 12

input_common: Add mouse panning

software_keyboard: Implement Finalize request command

configure_input_player_widget: Minor cleanup

common: Add -fsized-deallocation as a Clang flag

core: Add -fsized-dealloction as a Clang flag

configure_input_player_widget: Silence unused variable warnings

Prevents clang 11 from throwing an error since these variables are
unused.

Prevents an operator delete error when compiling with Clang 11.

Prevents a operator delete error when compiling with Clang 11.

udp: Silence warnings on Clang 12

video_core: Remove unused functions and variables

Clang 12 currently falls over in the face of this.

Prevents warnings on clang 12. This path is reachable on other
variations of the build that disable the unreachable macro.

We were previously the name of the object being initialized within its
own initializer, which results in uninitialized data being read.

Simply mark them as unused for now.

Prevents compilation errors on clang 12 due to incomplete types within a
unique_ptr member.

Resolves warnings on clang 12

Silences a few warnings on clang 12.

Reduces the amount of code to read in expressions a little bit by
separating constituents out a little.

Previously a function was copying an array of 20 std::string instances
by value.

* Add some depth to ProJoysticks

* address comments

* clang

* address nits

* fix wrong inner_offset when offset.x was 0

cmake: Revert FFmpeg 4.3.1 update for Windows builds

The new 4.3.1 externals build seems to not be compatible with yuzu. This also fixes an oversight when renaming CMake variables.