Emulate GL_LINEAR/NEAREST minification filters using minLod = 0 and maxLod = 0.25 during sampler creation

maxwell_to_vk: Reorder filtering modes to start with None, then Nearest, then Linear.
maxwell_to_vk: Logs filter modes under UNREACHABLE_MSG instead of UNIMPLEMENTED_MSG, since any unknown filter modes are invalid and not unimplemented.
maxwell_to_vk: Return VK_SAMPLER_MIPMAP_MODE_NEAREST instead of VK_SAMPLER_MIPMAP_MODE_LINEAR when mipmap_filter is None with the description from the VkSamplerCreateInfo(3) man page.

maxwell_to_gl: Log unimplemented features under UNIMPLEMENTED_MSG instead of LOG_ERROR to bring into parity with maxwell_to_vk
maxwell_to_gl: Deduplicate logging in VertexType(), merging them into one.

maxwell_to_gl: Return GL_NEAREST instead of GL_LINEAR if an unknown texture filter mode is encountered.
maxwell_to_gl: Log the mipmap filter mode if an unknown value is passed in.
maxwell_to_gl: Reorder filtering modes to start with None, then Nearest, then Linear.

gl_device: Reserve 4 image bindings for fragment stage

arm_dynarmic: CP15 changes

xbyak_abi: Cleanup

macro_jit_x64: Cleanup

qt_themes: remove unknown qss property from dark theme

* externals: Revert to libressl, as build is broken with find_package(OpenSLL).

* fixup! externals: Revert to libressl, as build is broken with find_package(OpenSLL).

* fixup! externals: Revert to libressl, as build is broken with find_package(OpenSLL).

gl_arb_decompiler: Implement an assembly shader decompiler

yuzu/frontend: Remove internal resolution option

Due to the limitation of GL_MAX_IMAGE_UNITS being low (8) on Intel's and Nvidia's proprietary drivers, we have to reserve an appropriate amount of image bindings for each of the stages. So far games have been observed to use 4 image bindings on the fragment stage (Kirby Star Allies) and 1 on the vertex stage (TWD series).
No games thus far in my limited testing used more than 4 images concurrently and across all currently active programs.
This fixes shader compilation errors on Kirby Star Allies on OpenGL (GLSL/GLASM)

CMakeLists: xbyak comes before dynarmic

buffer_cache: Avoid passing references of shared pointers and misc style changes

Not required, as PARAMETERS can just be incremented directly.

All registers are now callee-save registers.

RBX and RBP selected for STATE and RESULT because these are most commonly accessed; this is to avoid the REX prefix.
RBP not used for STATE because there are some SIB restrictions, RBX emits smaller code.

Unnecessary since this is just an offset from STATE.

This can be passed in as an argument instead.

Unnecessary variable.

This Reg64 codepath has the exact same behaviour as the Reg32 one.

Pushing GPRs twice.

video_core/macro_jit_x64: Remove initializer in member variable

Fix build time issues on gcc. Confirmed through asan that avoiding this
initialization is safe.

nvdrv: Fix GetTPCMasks for ioctl3

kernel: Account for system resource size for memory usage

gl_rasterizer: Mark vertex buffers as dirty after buffer cache invalidation

shader/texture: Join separate image and sampler pairs offline

shader_cache: Implement a generic runtime shader cache

kernel: ResourceLimit::Reserve remove useless while loop

Emit code compatible with NV_gpu_program5.
This should emit code compatible with Fermi, but it wasn't tested on
that architecture. Pascal has some issues not present on Turing GPUs.