Legacy varyings are special attributes carried over in hardware from
the OpenGL 1 and OpenGL 2 days. These were generally used instead of the
generic attributes we use today. They are deprecated or removed from
most APIs, but Nvidia still ships them in hardware.

To implement these, this commit maps them 1:1 to OpenGL compatibility.

PageTable: move backing addresses to a children class as the CPU page table does not need them.

texture_cache: Report incompatible textures as black

texture_cache/surface_params: Force depth=1 on 2D textures

video_core: Initial implementation of transform feedbacks

This PR aims to reduce the memory usage in the CPU page table by moving
GPU specific parameters into a child class. This saves 1Gb of Memory for
most games.

Use INSERT_UNION_PADDING_WORDS instead of alignas to ensure a size
requirement.

Co-Authored-By: Mat M. <mathew1800@gmail.com>

We sometimes have to slice attributes in different parts. This is needed
for example in instances where the game feedbacks 3 components but
writes 4 from the shader (something that is possible with
GL_NV_transform_feedback).

gl_shader_cache: Rework shader cache and store texture arrays

gl_rasterizer: Implement polygon modes and fill rectangles

vk_rasterizer: fix mistype on SetupGraphicsImages

vk_rasterizer: Support disabled uniform buffers

Some games bind incompatible texture types to certain types.
For example Astral Chain binds a 2D texture with 1 layer (non-array) to
a cubemap slot (that's how it's used in the shader). After testing this
in hardware, the expected "undefined behavior" is to report all pixels
as black.

We already have a path for reporting black textures in the texture
cache. When textures types are incompatible, this commit binds these
kind of textures. This is done on the API agnostic texture cache so no
extra code has to be inserted on OpenGL or Vulkan.

As a side effect, this fixes invalidations of ASTC textures on Astral
Chain. This happened because yuzu detected a cube texture and forced
6 faces, generating a texture larger than what the TIC reported.

Sometimes games will sample a 2D array TIC with a 2D access in the
shader. This causes bad interactions with the rest of the texture cache.
To emulate what the game wants to do, force a depth=1 on 2D textures
(not 2D arrays) and let the texture cache handle the rest.

Small corrections and features to microprofile

framebuffer_layout.h: drop the use of enum for screen dimensions

A previous commit introduced a way to declare as few render targets as
possible. Turns out this introduced a regression in some games.

gl_shader_manager: Fix interaction between graphics and compute

+clang format