- Also implement D0 LUT enable.

- No functional difference.

- Gets us LUT interpolation for free.
- Some older Intel GPU drivers did not support the big UBOs needed to store the LUTs.

- Diffuse
- Distance attenuation
- float16/float20 types
- Vertex Shader 'view' output

hwrasterizer: Use proper cached framebuffer addr/size

backend: defaulted move constructor/assignment

services: minor changes 

OpenGL: Downgrade GL_DEBUG_SEVERITY_NOTIFICATION to Debug logging level

The nVidia driver is *extremely* spammy on this category, sending a
message on every buffer or texture upload, slowing down the emulator and
making the log useless.

Memory: Implemented MMIO

color: Make trivial helpers constexpr

Shader JIT: Fix off-by-one error when compiling JMPs

Shader: Implement "invert condition" feature of IFU instruction

Debugger: Use 3dbrew names for GPU registers

elf: Don't cast away const

key_map: Use std::tie for comparisons

archive_backend: Remove unnecessary const from return types

This doesn't return by reference so const isn't really necessary