Add a square option to the settings object

[TyMick]

Add a square option to the settings object to customize whether the hook treats windows of equal width and height as portrait, landscape, or neither. The hook currently treats them as portrait.

• Options: "portrait", "landscape", "square"
• Default: "portrait"

When set to "square", the hook should return { orientation: "square", portrait: false, landscape: false } when the window is square.