This makes the formatting expectations more obvious (e.g. any zero padding specified
is padding that's entirely dedicated to the value being printed, not any pretty-printing
that also gets tacked on).

* CoreTiming: New CoreTiming; Add Test for CoreTiming

Now based on std::chrono, and also works in terms of emulated time
instead of frames, so we can in the future frame-limit even when the
display is disabled, etc.

The frame limiter can also be enabled along with v-sync now, which
should be useful for those with displays running at more than 60 Hz.

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.

Not to say these subscript operators aren't totally ugly as is.

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