nvdec: Fix VP9 reference frame refreshes

This was mainly used to keep track of mapped buffers for later unmapping.  Since unmap is no longer implemented, this no longer seves a valuable purpose.

With reference frames refreshes fix, we no longer need to buffer two frames in advance.
We can also remove other unused or otherwise unneeded variables.

This resolves the artifacting when decoding VP9 streams.

Skip unmapping nvdec buffers to avoid breaking the continuity of the VP9 reference frame addresses, and the risk of invalidating data before the async GPU thread is done with it.

assert: Avoid empty macros

common: uuid: Add hex string to UUID constructor

applet_swkbd: Include the null terminator in the buffer size calculation

hex_util: Fix incorrect array size in AsArray

Some games may interpret the read string as a null-terminated string instead of just reading the string up to buffer_size.

Although this isn't used, this is a potential bug as HexStringToArray will perform an out-of-bounds read.

config: Read connected setting for controllers

Currently yuzu will read the mapping but does not connect a controller
despite adding subsequent configurations for it. Read the `connected`
setting for now as a boolean like the Qt frontend.

This allows for easily converting a hex string into a Common::UUID, which is backed by a 128 bit unsigned integer.

* nvdec: VA-API

* Verify formatting

* Forgot a semicolon for Windows

* Clarify comment about AV_PIX_FMT_NV12

* Fix assert log spam from missing negation

* vic: Remove forgotten debug code

* Address lioncash's review

* Mention VA-API is Intel/AMD

* Address v1993's review

* Hopefully fix CMakeLists style this time

* vic: Improve cache locality

* vic: Fix off-by-one error

* codec: Async

* codec: Forgot the GetValue()

* nvdec: Address ameerj's review

* codec: Fallback to CPU without VA-API support

* cmake: Address lat9nq's review

* cmake: Make VA-API optional

* vaapi: Multiple GPU

* Apply suggestions from code review

Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>

* nvdec: Address ameerj's review

* codec: Use anonymous instead of static

* nvdec: Remove enum and fix memory leak

* nvdec: Address ameerj's review

* codec: Remove preparation for threading

Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>

config: Only read/write current_user on global config

network: fix ternary operator in Socket::SendTo

This makes UnswizzleTexture up to two times faster. It is the main bottleneck in NVDEC video decoding.

Makes the default game list folder icons 48x48 by default instead of 64x64, and allows for selecting small (24x24) and large (72x72) icon sizes.

service: set: Correct copy amount in GetAvailableLanguageCodes

 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