ZMachine saves also includes the current execution
stack. So I'm honestly not sure how to create an
autosave in the background that has a valid stack
than can be properly restored. With an imminent
release, it's better to disable autosaves for now
All the other sub-engines use the engine or authoring system
name, not the name of particular interpreters. So I felt it
best to rename frotz to zcode for consistency
Eugene Sandulenko
Orgad Shaneh
Paul Gilbert