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

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

After a compute shader was set to the pipeline, no graphics shader was
invoked again. To address this use glUseProgram to bind compute shaders
(without state tracking) and call glUseProgram(0) when transitioning out
of it back to the graphics pipeline.

cubeb_sink: Don't discard other channels when performing downmixing

RenderDoc won't build shaders if we use GLSL compatibility.

This is required for Vulkan. Sampling integer textures with float
handles is illegal.

Registry consistency is something that practically can't happen and it
has a measurable runtime cost. Reduce it to a DEBUG_ASSERT.

Store information GLSL forces us to provide but it's dynamic state in
hardware (workgroup sizes, primitive topology, shared memory size).

Instead of pre-specializing shaders and then post-specializing them,
drop the later and only "specialize" the shader while decoding it.

video_core: Remove gl_state and use a state tracker based on dirty flags

textures: Fix anisotropy hack

Previous code could generate an anisotropy value way higher than x16.

Previously, when performing downmixing, we would discard all channels except the left and right one.
This implementation respects them when mixing down to Stereo.
It is taken from this document: http://www.atsc.org/wp-content/uploads/2015/03/A52-201212-17.pdf.

Fixes Luigis Mansion 3 cutscene and Bayonetta audio.

frontend/Graphics: Add "Advanced" graphics tab and experimental Anisotropic Filtering support

This should use Maxwell3D engine. Fixed some GPU error on Kirby and maybe other games.