Moved monitor from event to meta.
Working towards mac's entry point. It's moving to video.

Entry points of this nature are only useful for gui apps. We can't supply a
general entry point because, on most platforms, tui and gui apps have the same
entry point name, so there is no way to signal to a lib whether to use tui or
gui mechs.

This is ok, because normal tui apps don't need any special initialization.
They just fire off from main(), which is perfect.

Because gui apps are the only bits that need a special, abstract entry point,
and because the video lib must interact with a small state machine during
init, this entrypoint mech is moving to video.