This option allows picking the compatibility profile since a lot of bugs
are fixed in it. We devs will use this option to easierly debug current
problems in our Core implementation.:wq

- This will be used as a catch-all for slow-but-accurate GPU emulation paths.

These aren't used outside of this translation unit, so they can be
internally linked.

Makes code consistent with our style of defaulting special member
functions where applicable.

* implement frame limiter

* fixes

Also minor style changes

Allows users to choose a single screen layout or a large screen layout.
Adds a configuration option to change the prominent screen.

This makes clang-format useful on those.

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