Implement accessing textures through an index. It uses the same
interface as OpenGL, the main difference is that Vulkan bindings are
forced to be arrayed (the binding index doesn't change for stacked
textures in SPIR-V).

vk_shader_decompiler: Implement Layer output attribute

surface_base: Implement texture buffer flushes

Kernel: Refactors and Implement a TimeManager and SchedulerLocks

audio_core: interpolate: Fix include for climits (Linux build break).

audio_core: Switch to a faster interpolation technique

shader/texture: Fix illegal 3D texture assert

Fix typo in the illegal 3D texture assert logic. We care about catching
arrayed 3D textures or 3D shadow textures, not regular 3D textures.

renderer_vulkan: Add the rest of case for TryConvertBorderColor

vk_shader: Implement ImageLoad

vulkan: add DXT23_SRGB

texture_cache: Avoid matches in 3D textures

video_core: memory_manager: Flush/invalidate asynchronously when possible.

Update httplib to 0.5.5

shader/texture: Allow 2D shadow arrays and simplify code

- Minor perf improvement.

maxwell_3d: Unify draw methods

gl_rasterizer: Use the least generic OpenGL draw function possible

shader_conversion: add conversion I2F for Short