gdbstub: Remove global variable from public interface

Service/CECD: Add cecd:ndm service

hid: Get rid of a double -> float truncation warning

Currently, this is only ever queried, so adding a function to check if the
server is enabled is more sensible.

If directly modifying this externally is ever desirable, it should be done
by adding a function to the interface, rather than exposing implementation
details directly.

core: Add missing #pragma once directives where applicable

float literals need to have the 'f' prefix.

act: Fix docstring typo

These aren't the AM services.

shader_jit_x64: Use LOOPCOUNT_REG as a 64-bit reg when indexing

Service/ACT: move ACT services to folder

Memory: Always flush whole pages from surface cache

This prevents individual writes touching a cached page, but which don't
overlap the surface, from constantly hitting the surface cache lookup.

VideoCore: Eliminate an unnecessary copy in the drawcall loop

Convert shader JIT to Xbyak

Kernel/IPC: Use Ports and Sessions as the fundamental building block of Inter Process Communication.

Required to be able to use Xbyak in Citra without header conflicts.

CMakeLists: Autodetect clang and only then use libc++

Minor amendment of GSP_GPU::ImportDisplayCaptureInfo code

time_stretch: Add missing #pragma once directive

Unbreak QT-only build after 75ee2f8c

Support mingw cross-compilation

APT::GetStartupArgument: force clear startup argument

The new Qt event syntax allows for regular member functions to be used in
connect(), so explicitly indicating slots isn't necessary.

appendRow takes a QList by const reference, so it doesn't need to be
modifiable.