Re-added overwritten scene stuff, minor settings updates

The overwritten stuff was just one gameobject: a green indicator of when the
player was supposed to start interacting with the tea set. This icon isn't
very pretty, so we could have someone on the art team come up with
something that looks better.

Also, a change has been made to the Settings.debug variable. It no longer
has to be set; it'll be set to true or false automatically, depending on
whether the application is running on a standalone build or in the editor.