file_sys/directory: Make EntryType an enum class

video_core/gpu_thread: Tidy up SwapBuffers()

We can just use std::nullopt and std::make_optional to make this a
little bit less noisy.

video_core/const_buffer_locker: Remove #pragma once from cpp file

Tidies it up a little bit visually.

Silences a compiler warning.

This can trivially be an enum class rather than a regular enum, making
it more strongly typed.

gl_device: Deduce indexing bug from device instead of heuristic

* core_timing: Use better reference tracking for EventType.

- Moves ownership of the event to the caller, ensuring we don't fire events for destroyed objects.
- Removes need for unique names - we won't be using this for save states anyways.

gl_shader_decompiler: Fix casts from fp32 to fp16

kernel: Fix reference management for client/server session.

Casts from f32 to f16 zeroes the higher half of the target register.

- Fixes shutdown crash and crash in Pokemon SwSh.

The heuristic to detect AMD's driver was not working properly since it
also included Intel. Instead of using heuristics to detect it, compare
the GL_VENDOR string.

ci: Continue pipeline on clang format failure

gl_texture_cache: Apply sRGB on blits

service: Update function tables

gpu_thread: Don't spin wait if there are no GPU commands.

* kernel: Replace usage of boost::intrusive_ptr with std::shared_ptr for kernel objects.

- See https://github.com/citra-emu/citra/pull/4710 for details.

gl_shader_cache: Miscellaneous changes to shaders

glBlitFramebuffer keeps in mind GL_FRAMEBUFFER_SRGB's state. Enable this
depending on the target surface pixel format.

maxwell_3d: Fix stencil_back_func_mask offset

svc: GetSystemTick should return cntpct_el0, not core ticks.

Port citra-emu/citra#4964: "Unfold UNREACHABLE implementation for dumb compilers"

buffer_cache: Remove brace initialized for objects with default constructor

Kernel: Correct behavior of Condition Variables to be more similar to real hardware.

gl_shader_gen: Apply default value to gl_Position

Kernel: Correct Cancel Synchronization.

We relies on UNREACHABLE's noreturn attribute to eliminate parent's "no return value" warning. However, this was wrapped in a `if(!false)` block, which compilers may not unfold to recognize the noreturn nature.

SSBOs and other resources are limited per pipeline on Intel and AMD.
Heuristically reserve resources per stage having in mind the reported
OpenGL limits.

glBindTextureUnit doesn't support null textures. Skip binding these.

Intel's proprietary driver enters in a corrupt state when compute
shaders are executed. For now, disable these.

The current shared memory size seems to be smaller than what the game
actually uses. This makes Nvidia's driver consistently blow up; in the
case of FE3H it made it explode on Qt's SwapBuffers while SDL2 worked
just fine. For now keep this hack since it's still progress over the
previous hardcoded shared memory size.