Global keys

These keys perform the same action in any mode.

Key	Action
`q`, `Q`	Quit
`s`, `S`	Save a screenshot of the current map
`Ctrl+n`, `Ctrl+N`	Start a new game
`Ctrl+o`, `Ctrl+O`	Load a saved game from disk
`Ctrl+s`, `Ctrl+S`	Save the current game to disk
`+`	Zoom in
`-`	Zoom out