Set of refactors for Kernel Synchronization and Hardware Constants

shader/decode: Fix constant buffer offsets

Use config mode for finding SDL2 with CMake

update hwopus DecodeInterleaved for FW 7.0.0+

GPU: Refactor queries implementation and correct GPU Clock.

address_arbiter: Minor cleanup to list querying

Same behavior, but without the need to explicitly loop through
everything manually.

Simplifies the overall function and also allows for it to become a
const-qualified member function.

bcat/backend: Prevent fmt exception in debug log within NullBackend::Clear()

kernel/thread: Remove trivial usages of the global system accessor

Aligns the '=' to be consistent with the rest of the logs within this
source file.

A formatting specifier within Clear wasn't being used, which will cause
fmt to throw an exception. This fixes that.

We can just use the kernel member variable directly instead of going
through the system to obtain the same thing.

trivial change,
see https://switchbrew.org/wiki/Audio_services#IHardwareOpusDecoder

gl_rasterizer: Implement GL_POINT_SPRITE

maxwell_3d: Fix stencil back mask

Remove option "Show files with type 'Unknown'"

hle: services: Use std::shared_ptr instead of copy by value.
- This is a prerequisite to adding a mutex to `ServiceFramework`, which cannot be copied.
- This will be used for threaded services.

gpu_thread: Use MPSCQueue for GPU commands.

video_core: memory_manager: Use GPU interface for cache functions.

- Necessary for multiple service threads.

maxwell_to_gl: Implement R8G8_USCALED

shader/shift: Implement SHF

hle: services: Fix prepo IPC, and add better error checking.

gl_rasterizer: Fix instanced draw arrays

applets: Fixes for software keyboard and transfer memory.