Previously there was a split where some of the services were in the
Service namespace and others were not.

* implement frame limiter

* fixes

Fixes #1960.

the old implementation modifies the loop variable in the loop. Though it actually works, it is really confusing. Makes it morereadable now.

previous commits changes the behaviour of interrupt when meeting invalid params. Regresses to the same behaviour as before
needs more hwtest

prevent further operation with invalid values which may cause assertion failure or divided by zero.
needs more hwtest

The old code indented too much to read. Split into functions and do general cleanup.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

There's no reason to allow direct access to the unique_ptr instance. Only
its contained pointer.

This commit:
* Adds a new subproject, audio_core.
* Defines structures that exist in DSP shared memory.
* Hooks up various other parts of the emulator into audio core.

This sets the foundation for a later HLE DSP implementation.

This removes explicit checks sprinkled all over the codebase to instead
just have the SW rasterizer expose an implementation with no-ops for
most operations.

This brings goodies such as a configurable user interface and
multi-threaded timeline view.

Fixes glitchy garbage in Fire Emblem 3D scenes.

* IncomingDisplayTransfer: Triggered just before a display transfer is performed.
* GSPCommandProcessed: Triggered right after a GSP command is processed.
* BufferSwapped: Triggered when the frames flip

It tells the GPU to not swizzle/de-swizzle the input during the transfer.

This is exposed in the GUI as a new "CiTrace Recording" widget.

Playback is implemented by a standalone 3DS homebrew application (which only runs reliably within Citra currently; on an actual 3DS it will often crash still).

Changing it makes emulation inherently inaccurate. It also had a wrong
default value (30, whereas the real system has a refresh rate of 60 Hz)
which, even if changed, would continue to be used unless people manually
removed it from their config files.

memory.cpp/h contains definitions related to acessing memory and
configuring the address space
mem_map.cpp/h contains higher-level definitions related to configuring
the address space accoording to the kernel and allocating memory.

Rephrased some comments.