externals: update fmt to 6.0.0

gl_shader_decompiler: Rework GLSL decompiler type system

* AM: Implement IApplicationFunctions::GetGpuErrorDetectedSystemEvent

* Remove unneeded event clear

* Fix event name

service/audio/audren_u: Stub IAudioDevice::GetAudioDeviceOutputVolume

Port citra-emu/citra#3617: "QT: Add support for multiple game directories"

Ported from https://github.com/citra-emu/citra/pull/3617.

GLSL decompiler type system was broken. We converted all return values
to float except for some cases where returning we couldn't and
implicitly broke the rule of returning floats (e.g. for bools or bool
pairs).

Instead of doing this introduce class Expression that knows what type a
return value has and when a consumer wants to use the string it asks for
it with a required type, emitting a runtime error if types are
incompatible.

This has the disadvantage that there's more C++ code, but we can emit
better GLSL code that's easier to read.

CI Fix (Azure/Testing) - apt update before upgrade. Use apt-get.

Identified a bug in the script which uses the azure image when attempting to upgrade python3-pip.
Package index was out of date because apt-get update was not ran before attempting the upgrade.

We can remove this since its already a f32 value

mii: Handle logging of unknown database source

 renderer_opengl: Implement RGB565 framebuffer format 

shader_ir/conversion: Implement F2I and F2F F16 selector

float_set_predicate: Add missing negation bit for the second operand

maxwell_3d: Fix macro binding cursor

Port citra-emu/citra#4914: "Fix to Windows sleep issues"

configuration/config: Add missing screenshot path read

Volume is a f32 value. (SwIPC describes it as a u32, but it is actually f32 as corroborated by switchbrew docs and SetAudioDeviceOutputVolume)

 ```cpp
const f32 volume = rp.Pop<f32>();
```

I missed this in my original PR (https://github.com/yuzu-emu/yuzu/pull/1886).

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

MaxwellDMA: Fixes, corrections and relaxations.

* texture_cache/surface_params: Remove unused local variable

* rasterizer_interface: Add missing documentation commentary

* maxwell_dma: Remove unused rasterizer reference

* video_core/gpu: Sort member declaration order to silent -Wreorder warning

* fermi_2d: Remove unused MemoryManager reference

* video_core: Silent unused variable warnings

* buffer_cache: Silent -Wreorder warnings

* kepler_memory: Remove unused MemoryManager reference

* gl_texture_cache: Add missing override

* buffer_cache: Add missing include

* shader/decode: Remove unused variables

gl_buffer_cache: Add missing include

RasterizerInterface was considered an incomplete object by clang.

gl_texture_cache: Miscellaneous texture buffer fixes