core: inline CPU, 132 warnings fixed on GCC

Fix OSX build warnings about unhandled enumeration values.

video_core: silence unused-local-typedef boost related warnings on GCC

citra: add missing control paths for ResultStatus on rom load. Fix warning about unhandled enumeration values on OSX

core: emu_window.cpp, fix conversion warnings from float to s16 on MSVC

Switch ComputeHash64 len param to size_t instead of int

Updated nihstro to latest master. Fix warning on MSVC

fixed the override warning

```
In file included from citra/src/audio_core/sink_details.cpp:11:
citra/src/./audio_core/sdl2_sink.h:25:10: warning: 'SetDevice' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
    void SetDevice(int device_id);
         ^
citra/src/./audio_core/sink.h:39:18: note: overridden virtual function is here
    virtual void SetDevice(int device_id) = 0;
                 ^
```

More shader refactoring

* Initial Commit

Added Device logic to Sinks
Started on UI for selecting devices

Removed redundant import

* Audio Core: Complete Device Switching

Complete the device switching implementation by allowing the output
device to be loaded, changed and saved through the configurations menu.

Worked with the Sink abstraction and tuned the "Device Selection"
configuration so that the Device List is automatically populated when
the Sink is changed.
This hopefully addresses the concerns and recommendations mentioned in
the comments of the PR.

* Clean original implementation.

* Refactor GetSinkDetails

This doesn't belong in LoadInputVertex because it also happens for
non-VS invocations. Since it's not used by the JIT it seems adequate to
initialize it in the interpreter which is the only thing that cares
about them.

Currently there's only a single dummy implementation, which will be
split in a following commit.

This removes all implicit dependency of ShaderState on global PICA
state.

Service/NFC: stub some functions

Fixing some MSVC warnings