Pad FixedPipelineState's size to 384 bytes to be a multiple of 16.

Compare the whole struct with std::memcmp and hash with CityHash. Using
CityHash instead of a naive hash should reduce the number of collisions.
Improve used type traits to ensure this operation is safe.

With these changes the improvements to the hashable pipeline state are:

Optimized structure
Hash:            89 ns
Comparison:     103 ns
Construction*:  164 ns
Struct size:    384 bytes

Original structure
Hash:           148 ns
Equal:          174 ns
Construction*:  281 ns
Size:          1384 bytes

* Attribute state initialization is not measured

These measures are averages taken with std::chrono::high_accuracy_clock
on MSVC shipped on Visual Studio 16.6.0 Preview 2.1.

Reduce FixedPipelineState's size to 364 bytes.

Reduce FixedPipelineState's size to 600 bytes.

Reduce FixedPipelineState's size to 632 bytes.

Reduce FixedPipelineState's size from 1384 to 664 bytes

Revert "gl_shader_cache: Use CompileDepth::FullDecompile on GLSL"

file_util: Early-exit in WriteArray and ReadArray if specified lengths are zero

Implement a new virtual memory manager

gl_query_cache: Resolve use-after-move in CachedQuery move assignment operator

- Should be no functional changes.

- Includes removing some service impls. that are untested.

- Includes removing some SVC impls. that are untested.

- Fixes Super Smash Bros. Ultimate.

- More consistent with other system components.