A set of flags. Active flags are in the dictionary as true, while inactive flags aren't present at all.
To write to this, use an array[string] of the mouse buttons that should be possible to use with on button. The flag "left-and-right" can also be set, which will set "left" and "right" to true.
Dict<"left" | "right" | "middle" | "button-4" | "button-5" | "button-6" | "button-7" | "button-8" | "button-9", true>