renderer_vulkan: Implement screenshots

vk_rasterizer: Flip viewport on Y_NEGATE

cmake, ci: Build bundled FFmpeg with yuzu

hle: api_version: Update HOS version to 12.1.0

Keeps us up to date with reporting the system version.

service: ns, set: Add PT_BR (Brazilian Portuguese)

emu_window: Remove global system instance

renderer_vulkan: Add setting to log pipeline statistics

applet_swkbd: Correct string buffer size calculation

It was just the one in emu_window_sdl2, but since _gl and _vk inherit
from it, they all needed adjustments.

Leaves just the one auto system& in main().

The buffer size here does not include the initial 8 bytes.

shader: Fold UnpackFloat2x16 and PackFloat2x16

shader: Fold integer FMA from Nvidia's pattern 

Simplifies the code a bit when possible. These instructions should be
no-ops codegen wise.

service: ns: Map ZH_TW and ZH_CN to Traditional/Simplified Chinese

common: uuid: Return a lower-case hex string in Format

Matches OpenGL's behavior. I don't believe this register flips geometry,
but we have to try to match behavior on both backends.

OpenGL and Vulkan images render in different coordinate systems. This allows us to specify the coordinate system of the screenshot within each renderer

Allows specifying the framebuffer and render area dimensions, rather than being hard coded for the render window.

shader: Mark ConvertF16F32 and ConvertF32F16 as fp16 instructions

host_memory: enable fastmem on FreeBSD

general: Implement FullscreenMode enumeration 

applets/web: Addressing QT Navigation issues in Linux

cmake: unbreak libusb detection on FreeBSD

Fixes instances where fp16 types are not declared on SPIR-V but they are
used. This shouldn't happen on master, as it's been uncovered by an
additional optimization pass.

Use VK_KHR_pipeline_executable_properties when enabled and available to
log statistics about the pipeline cache in a game.

For example, this is on Turing GPUs when generating a pipeline cache
from Super Smash Bros. Ultimate:

Average pipeline statistics
==========================================
Code size:       6433.167
Register count:    32.939

More advanced results could be presented, at the moment it's just an
average of all 3D and compute pipelines.

render_target: Add missing initializer for size extent

common: fs: fs_util: Add BufferToUTF8String

src/common/host_memory.cpp:360:14: error: use of undeclared identifier
      'memfd_create'
        fd = memfd_create("HostMemory", 0);
             ^

HW.Memory <Critical> common/host_memory.cpp:HostMemory:492: Fastmem unavailable, falling back to VirtualBuffer for memory allocation

video_core/engine: Consistently initialize rasterizer pointers

exception: Make constructors explicit

video_core: Remove some unused variables

vulkan_wrapper: Fix SetObjectName() always indicating objects as images