Avoids unnecessary reference count increments where applicable and also
avoids reallocating a vector.

Unlikely to make a huge difference, but given how trivial of an
amendment it is, why not?

externals: Update fmt to 6.2.0

common/file_util: Allow access to files on network shares

video_code: Fix implicit switch fallthrough.

Since yesterday, this breaks the build on linux.
So let's fix it.

Keeps the library up to date.

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.