kernel/thread: Include thread-related enums within the kernel namespace

service: Use nested namespace specifiers where applicable

services/pl_u: Add missing Korean font to the fallback case for shared fonts

Previously, these were sitting outside of the Kernel namespace, which
doesn't really make sense, given they're related to the Thread class
which is within the Kernel namespace.

There were a few places where nested namespace specifiers weren't being
used where they could be within the service code. This amends that to
make the namespacing a tiny bit more compact.

ipc: fix spelling mistake

* gl_rasterizer: use ARB_multi_bind for uniform buffers

* address feedback

Previously this wasn't using the Korean font at all.

audio_core/sink_details: Change std::string parameter into std::string_view

yuzu/configure_gamelist: Mark combo-box strings as translatable

audio_core: Add audio stretching support

gl_rasterizer_cache: B5G6R5U should use GL_RGB8 as an internal format.

- Fixes a regression with Sonic Mania with ARB_texture_storage.

pl_u: Eliminate mutable file-scope state

shader_decompiler:  Implemented (Partially) Texture Processing Modes

kernel/errors: Amend invalid thread priority and invalid processor ID error codes

svc: Do nothing in svcOutputDebugString() if given a length of zero

Set yuzu project as default StartUp Project in Visual Studio

Set yuzu project as default StartUp Project in Visual Studio

This is what the kernel does for an out-of-range processor ID.

While unlikely, it does avoid constructing a std::string and
unnecessarily calling into the memory code if a game or executable
decides to be really silly about their logging.

This should be a u64 to represent size.

Given these are shown to the user, they should be translatable.

While we're at it, also set up the dialog to automatically retranslate
the dialog along with the combo boxes if it receives a LanguageChange
event.

We don't need to use an allocating container for these, given we know
the fixed amount of strings being used. This is just a waste of memory.

Keeps the individual initialization of the combo boxes logically separate.
We also shouldn't be dumping this sort of thing in the constructor
directly.

service/prepo: Move class into the cpp file

game_list: Resolve variable shadowing within LoadCompatibilityList()

service/audio: Replace includes with forward declarations where applicable

Port Citra #4047 & #4052: add change background color support

gl_rasterizer_cache: Improve accuracy of caching and copies.

gl_rasterizer: Use ARB_texture_storage.

- Fixes several rendering issues with Super Mario Odyssey.

"value" is already a used variable name within the outermost ranged-for
loop, so this variable was shadowing the outer one. This isn't a bug,
but it will get rid of a -Wshadow warning.

This way, we aren't constructing unnecessary QJsonValue instances.

A few headers were including other headers when a forward declaration
can be used instead, allowing the include to be moved to the cpp file.