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.

- This was holdover from citra.

vk_rasterizer: Use noexcept methods of std::bitset

Removes bounds checking from "texceptions" instances.

shader/bfi: Implement register-constant buffer variant

shader/arithmetic: Implement FCMP

GUI: Togglable graphics settings buttons in status bar

yuzu: Implement Vulkan frontend

input_common/udp: Minor changes

Previously the UDP backend would never actually get shut down.

Prevents trivial warnings and ensures interfaces are properly
maintained between the base class.

std::function is allowed to heap allocate if the size of the captures
associated with each lambda exceed a certain threshold. This prevents
potentially unnecessary reallocations from occurring.

Gets rid of a trivially avoidable atomic reference count increment and
decrement.

Future-proofs code if boost is ever updated.

Amends the constructor initializer list to specify the order of its
elements in the same order that initialization would occur.

shader: Remove curly braces initializers on shared pointers

Partially implement Indexed samplers in general and specific code in GLSL

Shifts a pair of registers to the right and returns the low register.

Shifts a pair of registers to the left and returns the high register.

GUI: Deadzone controls for sdl engine at configuration input

hid: Fix analog sticks directional states

core/arm: Remove usage of global GetCurrentThread()

kernel/physical_core: Make use of std::unique_ptr instead of std::shared_ptr

Revert "system_archive: Fix Korean and Chinese fonts"

Now both CPU backends go through their referenced system instance to
obtain the current thread.